[UDPv4]: Pass correct socket to ip_mc_sf_allow.

net/ipv4/udp.c

@@ -294,7 +294,7 @@ static inline struct sock *udp_v4_mcast_next(struct sock *sk,
 		    ipv6_only_sock(s)					||
 		    (s->sk_bound_dev_if && s->sk_bound_dev_if != dif))
 			continue;
-		if (!ip_mc_sf_allow(sk, loc_addr, rmt_addr, dif))
+		if (!ip_mc_sf_allow(s, loc_addr, rmt_addr, dif))
 			continue;
 		goto found;
   	}