l2tp: small cleanup

Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/l2tp/l2tp_ip.c

@@ -65,9 +65,7 @@ static struct sock *__l2tp_ip_bind_lookup(struct net *net, __be32 laddr, int dif
 			continue;
 
 		if ((l2tp->conn_id == tunnel_id) &&
-#ifdef CONFIG_NET_NS
-		    (sk->sk_net == net) &&
-#endif
+		    net_eq(sock_net(sk), net) &&
 		    !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) &&
 		    !(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
 			goto found;