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

networking/slattach.c

@@ -152,7 +152,7 @@ int slattach_main(int argc, char **argv)
 	INIT_G();
 
 	/* Parse command line options */
-	opt = getopt32(argc, argv, "p:s:c:ehmLF", &proto, &baud_str, &extcmd);
+	opt = getopt32(argv, "p:s:c:ehmLF", &proto, &baud_str, &extcmd);
 	/*argc -= optind;*/
 	argv += optind;