ceph: messenger: check return from get_authorizer

In prepare_connect_authorizer(), a connection's get_authorizer
method is called but ignores its return value. This function can
return an error, so check for it and return it if that ever occurs.

Signed-off-by: Alex Elder <[e-mail]>
Reviewed-by: Sage Weil <[e-mail]>

net/ceph/messenger.c

···
 	void *auth_buf;
 	int auth_len;
 	int auth_protocol;
+	int ret;
 
 	if (!con->ops->get_authorizer) {
 		con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN;
···
 	auth_buf = NULL;
 	auth_len = 0;
 	auth_protocol = CEPH_AUTH_UNKNOWN;
-	con->ops->get_authorizer(con, &auth_buf, &auth_len, &auth_protocol,
-				&con->auth_reply_buf, &con->auth_reply_buf_len,
-				con->auth_retry);
+	ret = con->ops->get_authorizer(con, &auth_buf, &auth_len,
+				&auth_protocol, &con->auth_reply_buf,
+				&con->auth_reply_buf_len, con->auth_retry);
 	mutex_lock(&con->mutex);
+
+	if (ret)
+		return ret;
 
 	if (test_bit(CLOSED, &con->state) || test_bit(OPENING, &con->state))
 		return -EAGAIN;