net/caif/caif_socket.c: remove unnecessary null test before debugfs_remove_recursive

based on checkpatch:
"debugfs_remove_recursive(NULL) is safe this check is probably not required"

Cc: Dmitry Tarnyagin <dmitry.tarnyagin@lockless.no>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/caif/caif_socket.c

@@ -908,7 +908,6 @@ static int caif_release(struct socket *sock)
 	sock->sk = NULL;
 
 	WARN_ON(IS_ERR(cf_sk->debugfs_socket_dir));
-	if (cf_sk->debugfs_socket_dir != NULL)
 	debugfs_remove_recursive(cf_sk->debugfs_socket_dir);
 
 	lock_sock(&(cf_sk->sk));