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/pscan.c b/networking/pscan.c
index 9eda168..5ae3e61 100644
--- a/networking/pscan.c
+++ b/networking/pscan.c
@@ -54,7 +54,7 @@
 	unsigned start;
 
 	opt_complementary = "=1"; /* exactly one non-option */
-	getopt32(argc, argv, "p:P:t:T:", &opt_min_port, &opt_max_port, &opt_timeout, &opt_min_rtt);
+	getopt32(argv, "p:P:t:T:", &opt_min_port, &opt_max_port, &opt_timeout, &opt_min_rtt);
 	argv += optind;
 	max_port = xatou_range(opt_max_port, 1, 65535);
 	port = xatou_range(opt_min_port, 1, max_port);