*: fix fallout from -Wunused-parameter

function                                             old     new   delta
bbunpack                                             358     366      +8
passwd_main                                         1070    1072      +2
handle_incoming_and_exit                            2651    2653      +2
getpty                                                88      86      -2
script_main                                          975     972      -3
inetd_main                                          2036    2033      -3
dname_enc                                            377     373      -4
make_new_session                                     474     462     -12
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/5 up/down: 12/-24)            Total: -12 bytes
   text    data     bss     dec     hex filename
 797429     658    7428  805515   c4a8b busybox_old
 797417     658    7428  805503   c4a7f busybox_unstripped

1 files changed, 6 insertions, 4 deletions

diff --git a/util-linux/fbset.c b/util-linux/fbset.c
index d616abd36..ab7770d4f 100644
--- a/util-linux/fbset.c
+++ b/util-linux/fbset.c
@@ -170,10 +170,10 @@ enum {
 };
 #endif
 
+#if ENABLE_FEATURE_FBSET_READMODE
 static int readmode(struct fb_var_screeninfo *base, const char *fn,
                                         const char *mode)
 {
-#if ENABLE_FEATURE_FBSET_READMODE
         FILE *f;
         char buf[256];
         char *p = buf;
@@ -257,11 +257,9 @@ static int readmode(struct fb_var_screeninfo *base, const char *fn,
                                 return 1;
                 }
         }
-#else
-        bb_error_msg("mode reading not compiled in");
-#endif
         return 0;
 }
+#endif
 
 static inline void setmode(struct fb_var_screeninfo *base,
                                         struct fb_var_screeninfo *set)
@@ -389,9 +387,13 @@ int fbset_main(int argc, char **argv)
         fh = xopen(fbdev, O_RDONLY);
         xioctl(fh, FBIOGET_VSCREENINFO, &var);
         if (g_options & OPT_READMODE) {
+#if !ENABLE_FEATURE_FBSET_READMODE
+                bb_show_usage();
+#else
                 if (!readmode(&var, modefile, mode)) {
                         bb_error_msg_and_die("unknown video mode '%s'", mode);
                 }
+#endif
         }
 
         setmode(&var, &varset);