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/udhcp/dhcpd.c b/networking/udhcp/dhcpd.c
index 2fd16ce..e722833 100644
--- a/networking/udhcp/dhcpd.c
+++ b/networking/udhcp/dhcpd.c
@@ -36,7 +36,7 @@
 	struct option_set *option;
 	struct dhcpOfferedAddr *lease, static_lease;
 
-	opt = getopt32(argc, argv, "fS");
+	opt = getopt32(argv, "fS");
 	argv += optind;
 
 	if (!(opt & 1)) { /* no -f */