fs: dlm: set is othercon flag

There is a is othercon flag which is never used, this patch will set it
and printout a warning if the othercon ever sends a dlm message which
should never be the case.
Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>

fs/dlm/lowcomms.c

@@ -938,6 +938,7 @@ static int accept_from_sock(struct listen_connection *con)
 			}
 
 			lockdep_set_subclass(&othercon->sock_mutex, 1);
+			set_bit(CF_IS_OTHERCON, &othercon->flags);
 			newcon->othercon = othercon;
 		} else {
 			/* close other sock con if we have something new */
@@ -1601,6 +1602,8 @@ static void process_send_sockets(struct work_struct *work)
 {
 	struct connection *con = container_of(work, struct connection, swork);
 
+	WARN_ON(test_bit(CF_IS_OTHERCON, &con->flags));
+
 	clear_bit(CF_WRITE_PENDING, &con->flags);
 	if (con->sock == NULL) /* not mutex protected so check it inside too */
 		con->connect_action(con);