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

diff --git a/networking/telnet.c b/networking/telnet.c
index 4e8b27b..ae526fa 100644
--- a/networking/telnet.c
+++ b/networking/telnet.c
@@ -583,7 +583,7 @@
 		bb_show_usage();
 
 #if ENABLE_FEATURE_TELNET_AUTOLOGIN
-	if (1 & getopt32(argc, argv, "al:", &G.autologin))
+	if (1 & getopt32(argv, "al:", &G.autologin))
 		G.autologin = getenv("USER");
 	argv += optind;
 #else