l2tp: remove useless NULL check in __l2tp_ip*_bind_lookup()

If "l2tp" was NULL, that'd mean "sk" is NULL too. This can't happen
since "sk" is returned by sk_for_each_bound().
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/l2tp/l2tp_ip.c

@@ -56,9 +56,6 @@ static struct sock *__l2tp_ip_bind_lookup(const struct net *net, __be32 laddr,
 		const struct l2tp_ip_sock *l2tp = l2tp_ip_sk(sk);
 		const struct inet_sock *inet = inet_sk(sk);
 
-		if (l2tp == NULL)
-			continue;
-
 		if ((l2tp->conn_id == tunnel_id) &&
 		    net_eq(sock_net(sk), net) &&
 		    !(inet->inet_rcv_saddr && inet->inet_rcv_saddr != laddr) &&

net/l2tp/l2tp_ip6.c

@@ -69,9 +69,6 @@ static struct sock *__l2tp_ip6_bind_lookup(const struct net *net,
 		const struct in6_addr *sk_raddr = &sk->sk_v6_daddr;
 		const struct l2tp_ip6_sock *l2tp = l2tp_ip6_sk(sk);
 
-		if (l2tp == NULL)
-			continue;
-
 		if ((l2tp->conn_id == tunnel_id) &&
 		    net_eq(sock_net(sk), net) &&
 		    (!sk_laddr || ipv6_addr_any(sk_laddr) || ipv6_addr_equal(sk_laddr, laddr)) &&