net_getsockname: do not dereference a NULL pointer

This very same check is present a couple of lines below, so there's no
point in repeating it. In any case the check must be done after checking
that the pointer is not NULL (which is done below).

Author: mardy

libogc/network_wii.c

@@ -1139,7 +1139,6 @@ s32 net_getsockname(s32 s, struct sockaddr *addr, socklen_t *addrlen)
 	s32 ret;
 
 	if (net_ip_top_fd < 0) return -ENXIO;
-	if (*addrlen<8) return -ENOMEM;
 
 	if (!addr) return -EINVAL;
 	if (!addrlen) return -EINVAL;