Add error check after allocation.

src/protocol/firefly_protocol_connection.c

@@ -120,7 +120,9 @@ int firefly_connection_open(
 	struct firefly_connection *conn;
 
 	conn = firefly_connection_new(actions, memory_replacements, event_queue, tc);
-	firefly_connection_set_context(conn, context);
+	if (conn) {
+		firefly_connection_set_context(conn, context);
+	}
 	return conn != NULL ? conn->event_queue->offer_event_cb(conn->event_queue,
 			FIREFLY_PRIORITY_HIGH, firefly_connection_open_event,
 			conn, 0, NULL) : -1;