sctp: fix dst leak

Commit 0ca50d12fe46 failed to release the reference to dst entries that
it decided to skip.

Fixes: 0ca50d12fe46 ("sctp: fix src address selection if using secondary addresses")
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sctp/protocol.c

@@ -511,8 +511,10 @@ static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
 		 */
 		odev = __ip_dev_find(sock_net(sk), laddr->a.v4.sin_addr.s_addr,
 				     false);
-		if (!odev || odev->ifindex != fl4->flowi4_oif)
+		if (!odev || odev->ifindex != fl4->flowi4_oif) {
+			dst_release(&rt->dst);
 			continue;
+		}
 
 		dst = &rt->dst;
 		break;