[X.25]: Add missing sock_put in x25_receive_data

__x25_find_socket does a sock_hold.
This adds a missing sock_put in x25_receive_data.
Signed-off-by: Andrew Hendry <andrew.hendry@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Adrian Bunk <bunk@stusta.de>

net/x25/x25_dev.c

@@ -57,6 +57,7 @@ static int x25_receive_data(struct sk_buff *skb, struct x25_neigh *nb)
 			sk_add_backlog(sk, skb);
 		}
 		bh_unlock_sock(sk);
+		sock_put(sk);
 		return queued;
 	}