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

loginutils/addgroup.c

@@ -139,7 +139,7 @@ int addgroup_main(int argc, char **argv)
 	 *  addgroup user group
 	 * Check for min, max and missing args */
 	opt_complementary = "-1:?2";
-	if (getopt32(argc, argv, "g:", &group)) {
+	if (getopt32(argv, "g:", &group)) {
 		gid = xatoul_range(group, 0, ((unsigned long)(gid_t)ULONG_MAX) >> 1);
 	}
 	/* move past the commandline options */