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

src/core/hubio.c

@@ -126,6 +126,7 @@ void hub_sendq_add(struct hub_sendq* q, struct adc_message* msg_)
 #ifdef DEBUG_SENDQ
 	debug_msg("hub_sendq_add", msg);
 #endif
+	assert(msg->cache && *msg->cache);
 	list_append(q->queue, msg);
 	q->size += msg->length;
 }
@@ -146,7 +147,7 @@ int hub_sendq_send(struct hub_sendq* q, struct hub_user* user)
 	int ret;
 	struct adc_message* msg = list_get_first(q->queue);
 	if (!msg) return 0;
-
+	assert(msg->cache && *msg->cache);
 	ret = net_con_send(user->connection, msg->cache + q->offset, msg->length - q->offset);
 
 	if (ret > 0)

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 */