modprobe: emit "can't open 'modules.dep': (errno)" instead of "module not found"

*: s/can't open %s/can't open '%s'/, it's better to use same string.

function                                             old     new   delta
do_modprobe                                          588     601     +13
config_file_action                                   339     345      +6
modprobe_main                                        565     570      +5
unable_to_open                                        14      16      +2
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/0 up/down: 26/0)               Total: 26 bytes
   text    data     bss     dec     hex filename
 816800     476    7892  825168   c9750 busybox_old
 816812     476    7892  825180   c975c busybox_unstripped

5 files changed, 19 insertions, 18 deletions

diff --git a/modutils/modprobe.c b/modutils/modprobe.c
index ad39be059..945483327 100644
--- a/modutils/modprobe.c
+++ b/modutils/modprobe.c
@@ -100,8 +100,7 @@ static int FAST_FUNC config_file_action(const char *filename,
         }
         config_close(p);
 error:
-        if (ENABLE_FEATURE_CLEAN_UP)
-                RELEASE_CONFIG_BUFFER(modname);
+        RELEASE_CONFIG_BUFFER(modname);
         return rc;
 }
 
@@ -141,8 +140,13 @@ static int do_modprobe(struct modprobe_conf *conf, const char *module)
         int rc = -1;
 
         p = config_open2(CONFIG_DEFAULT_DEPMOD_FILE, fopen_for_read);
+        /* Modprobe does not work at all without modprobe.dep,
+         * even if the full module name is given. Returning error here
+         * was making us later confuse user with this message:
+         * "module /full/path/to/existing/file/module.ko not found".
+         * It's better to die immediately, with good message: */
         if (p == NULL)
-                goto error;
+                bb_perror_msg_and_die("can't open '%s'", CONFIG_DEFAULT_DEPMOD_FILE);
 
         while (config_read(p, tokens, 2, 1, "# \t", PARSE_NORMAL)) {
                 colon = last_char_is(tokens[0], ':');
@@ -179,23 +183,21 @@ static int do_modprobe(struct modprobe_conf *conf, const char *module)
                         rc = bb_init_module(fn, options);
                         if (rc == 0)
                                 llist_add_to(&loaded, xstrdup(modname));
-                        if (ENABLE_FEATURE_CLEAN_UP)
-                                free(options);
+                        free(options);
                 }
 
-                if (ENABLE_FEATURE_CLEAN_UP)
-                        free(fn);
+                free(fn);
         }
 
-error_not_found:
+ error_not_found:
         config_close(p);
-error:
-        if (ENABLE_FEATURE_CLEAN_UP)
-                RELEASE_CONFIG_BUFFER(modname);
+
         if (rc > 0 && !(option_mask32 & INSMOD_OPT_SILENT))
                 bb_error_msg("failed to %sload module %s: %s",
                              (option_mask32 & MODPROBE_OPT_REMOVE) ? "un" : "",
                              module, moderror(rc));
+
+        RELEASE_CONFIG_BUFFER(modname);
         return rc;
 }
 
@@ -278,8 +280,7 @@ int modprobe_main(int argc UNUSED_PARAM, char **argv)
                                 char *realname = llist_pop(&conf->aliases);
                                 if (check_blacklist(conf, realname))
                                         do_modprobe(conf, realname);
-                                if (ENABLE_FEATURE_CLEAN_UP)
-                                        free(realname);
+                                free(realname);
                         }
                 }
                 argv++;
diff --git a/procps/fuser.c b/procps/fuser.c
index 7297bfe66..dc3d01bda 100644
--- a/procps/fuser.c
+++ b/procps/fuser.c
@@ -325,7 +325,7 @@ Find processes which use FILEs or PORTs
                         free(proto);
                 } else { /* FILE */
                         if (!file_to_dev_inode(*pp, &dev, &inode))
-                                bb_perror_msg_and_die("can't open %s", *pp);
+                                bb_perror_msg_and_die("can't open '%s'", *pp);
                         ilist = add_inode(ilist, dev, inode);
                 }
                 pp++;
diff --git a/shell/ash.c b/shell/ash.c
index 3abca75fe..b33351674 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -4540,7 +4540,7 @@ forkchild(struct job *jp, /*union node *n,*/ int mode)
                 if (jp->nprocs == 0) {
                         close(0);
                         if (open(bb_dev_null, O_RDONLY) != 0)
-                                ash_msg_and_raise_error("can't open %s", bb_dev_null);
+                                ash_msg_and_raise_error("can't open '%s'", bb_dev_null);
                 }
         }
         if (!oldlvl) {
@@ -9573,7 +9573,7 @@ setinputfile(const char *fname, int flags)
         if (fd < 0) {
                 if (flags & INPUT_NOFILE_OK)
                         goto out;
-                ash_msg_and_raise_error("can't open %s", fname);
+                ash_msg_and_raise_error("can't open '%s'", fname);
         }
         if (fd < 10) {
                 fd2 = copyfd(fd, 10);
diff --git a/util-linux/fdisk.c b/util-linux/fdisk.c
index b1f0b65c6..dc61e238a 100644
--- a/util-linux/fdisk.c
+++ b/util-linux/fdisk.c
@@ -83,7 +83,7 @@ struct partition {
         unsigned char size4[4];         /* nr of sectors in partition */
 } PACKED;
 
-static const char unable_to_open[] ALIGN1 = "can't open %s";
+static const char unable_to_open[] ALIGN1 = "can't open '%s'";
 static const char unable_to_read[] ALIGN1 = "can't read from %s";
 static const char unable_to_seek[] ALIGN1 = "can't seek on %s";
 
diff --git a/util-linux/umount.c b/util-linux/umount.c
index 0662cea1b..901c9094f 100644
--- a/util-linux/umount.c
+++ b/util-linux/umount.c
@@ -69,7 +69,7 @@ int umount_main(int argc UNUSED_PARAM, char **argv)
         fp = setmntent(bb_path_mtab_file, "r");
         if (!fp) {
                 if (opt & OPT_ALL)
-                        bb_error_msg_and_die("can't open %s", bb_path_mtab_file);
+                        bb_error_msg_and_die("can't open '%s'", bb_path_mtab_file);
         } else {
                 while (getmntent_r(fp, &me, path, PATH_MAX)) {
                         /* Match fstype if passed */