don't pass argc in getopt32, it's superfluous

(add/remove: 0/0 grow/shrink: 12/131 up/down: 91/-727) Total: -636 bytes
   text    data     bss     dec     hex filename
 773469    1058   11092  785619   bfcd3 busybox_old
 772644    1058   11092  784794   bf99a busybox_unstripped

editors/cmp.c

@@ -61,7 +61,7 @@ int cmp_main(int argc, char **argv)
 			USE_DESKTOP(":?4")
 			SKIP_DESKTOP(":?2")
 			":l--s:s--l";
-	opt = getopt32(argc, argv, opt_chars);
+	opt = getopt32(argv, opt_chars);
 	argv += optind;
 
 	filename1 = *argv;