Added lots of new asserts which should trigger in case we double delete a ADC message.

src/core/route.c

@@ -106,6 +106,8 @@ int route_to_user(struct hub_info* hub, struct hub_user* user, struct adc_messag
 	if (!user->connection)
 		return 0;
 
+	assert(msg->cache && *msg->cache);
+
 	if (hub_sendq_is_empty(user->send_queue) && !user_flag_get(user, flag_pipeline))
 	{
 		/* Perform oportunistic write */