fs: dlm: use saved sk_error_report()

This patch changes the handling of calling the original
sk_error_report() by not putting it on the stack and calling it later.
If the listen_sock.sk_error_report() is NULL in this moment it indicates
a bug in our implementation.
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>

fs/dlm/lowcomms.c

@@ -569,11 +569,8 @@ int dlm_lowcomms_nodes_set_mark(int nodeid, unsigned int mark)
 static void lowcomms_error_report(struct sock *sk)
 {
 	struct connection *con = sock2con(sk);
-	void (*orig_report)(struct sock *) = NULL;
 	struct inet_sock *inet;
 
-	orig_report = listen_sock.sk_error_report;
-
 	inet = inet_sk(sk);
 	switch (sk->sk_family) {
 	case AF_INET:
@@ -618,8 +615,7 @@ static void lowcomms_error_report(struct sock *sk)
 		queue_work(send_workqueue, &con->swork);
 
 out:
-	if (orig_report)
-		orig_report(sk);
+	listen_sock.sk_error_report(sk);
 }
 
 static void restore_callbacks(struct socket *sock)