more -Wall warning fixes from Cristian Ionescu-Idbohrn.

This time it resulted in small code changes:

function                                             old     new   delta
nexpr                                                820     828      +8
tail_main                                           1200    1202      +2
wrapf                                                166     167      +1
parse_mount_options                                  227     209     -18
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/1 up/down: 11/-18)             Total: -7 bytes

5 files changed, 10 insertions, 10 deletions

diff --git a/libbb/lineedit.c b/libbb/lineedit.c
index d1a7a4bac..62dcc55cd 100644
--- a/libbb/lineedit.c
+++ b/libbb/lineedit.c
@@ -262,7 +262,7 @@ static void input_backward(unsigned num)
                 return;
         cursor -= num;
 
-        if (cmdedit_x >= num) {
+        if ((unsigned)cmdedit_x >= num) {
                 cmdedit_x -= num;
                 if (num <= 4) {
                         /* This is longer by 5 bytes on x86.
@@ -321,7 +321,7 @@ static void input_delete(int save)
 {
         int j = cursor;
 
-        if (j == command_len)
+        if (j == (int)command_len)
                 return;
 
 #if ENABLE_FEATURE_EDITING_VI
@@ -830,7 +830,7 @@ static void input_tab(smallint *lastWasTab)
 
         if (!*lastWasTab) {
                 char *tmp, *tmp1;
-                int len_found;
+                size_t len_found;
 /*              char matchBuf[MAX_LINELEN]; */
 #define matchBuf (S.input_tab__matchBuf)
                 int find_type;
@@ -1787,7 +1787,7 @@ int read_line_input(const char *prompt, char *command, int maxsize, line_input_t
                         if (vi_cmdmode)  /* Don't self-insert */
                                 break;
 #endif
-                        if (command_len >= (maxsize - 2))        /* Need to leave space for enter */
+                        if ((int)command_len >= (maxsize - 2))        /* Need to leave space for enter */
                                 break;
 
                         command_len++;
diff --git a/libbb/md5.c b/libbb/md5.c
index 56f97270d..8d4b9fe52 100644
--- a/libbb/md5.c
+++ b/libbb/md5.c
@@ -383,7 +383,7 @@ void md5_hash(const void *buffer, size_t len, md5_ctx_t *ctx)
         // Process all input.
 
         while (len) {
-                int i = 64 - ctx->buflen;
+                unsigned i = 64 - ctx->buflen;
 
                 // Copy data into aligned buffer.
 
diff --git a/libbb/read.c b/libbb/read.c
index 288358d79..fb903c18a 100644
--- a/libbb/read.c
+++ b/libbb/read.c
@@ -111,7 +111,7 @@ void xread(int fd, void *buf, size_t count)
 {
         if (count) {
                 ssize_t size = full_read(fd, buf, count);
-                if (size != count)
+                if ((size_t)size != count)
                         bb_error_msg_and_die("short read");
         }
 }
@@ -160,7 +160,7 @@ char *xmalloc_reads(int fd, char *buf, size_t *maxsz_p)
 
         goto jump_in;
         while (sz < maxsz) {
-                if (p - buf == sz) {
+                if ((size_t)(p - buf) == sz) {
  jump_in:
                         buf = xrealloc(buf, sz + 128);
                         p = buf + sz;
diff --git a/libbb/u_signal_names.c b/libbb/u_signal_names.c
index 97e9949e9..7a0f75d6f 100644
--- a/libbb/u_signal_names.c
+++ b/libbb/u_signal_names.c
@@ -130,7 +130,7 @@ int get_signum(const char *name)
                 return i;
         if (strncasecmp(name, "SIG", 3) == 0)
                 name += 3;
-        for (i = 0; i < ARRAY_SIZE(signals); i++)
+        for (i = 0; (size_t)i < ARRAY_SIZE(signals); i++)
                 if (strcasecmp(name, signals[i]) == 0)
                         return i;
 
@@ -172,7 +172,7 @@ void print_signames(void)
 {
         int signo;
 
-        for (signo = 1; signo < ARRAY_SIZE(signals); signo++) {
+        for (signo = 1; (size_t)signo < ARRAY_SIZE(signals); signo++) {
                 const char *name = signals[signo];
                 if (name[0])
                         puts(name);
diff --git a/libbb/xfuncs_printf.c b/libbb/xfuncs_printf.c
index d3fb39f04..105939b5e 100644
--- a/libbb/xfuncs_printf.c
+++ b/libbb/xfuncs_printf.c
@@ -204,7 +204,7 @@ void xwrite(int fd, const void *buf, size_t count)
 {
         if (count) {
                 ssize_t size = full_write(fd, buf, count);
-                if (size != count)
+                if ((size_t)size != count)
                         bb_error_msg_and_die("short write");
         }
 }