Cleaned up usage of linked lists and added missing functionality.

- Added a list_remove_first() which is generally better than list_remove()
  provided you want to remove the first element.
- Added a list_append_list() to append and move all nodes from one list to
  another.

src/core/eventqueue.c

@@ -90,16 +90,10 @@ int event_queue_process(struct event_queue* queue)
 		
 	/* unlock queue */
 	queue->locked = 0;
-	
+
 	/* transfer from secondary queue to the primary queue. */
-	data = (struct event_data*) list_get_first(queue->q2);
-	while (data)
-	{
-		list_remove(queue->q2, data);
-		list_append(queue->q1, data);
-		data = (struct event_data*) list_get_first(queue->q2);
-	}
-	
+	list_append_list(queue->q1, queue->q2);
+
 	/* if more events exist, schedule it */
 	if (list_size(queue->q1))
 	{

src/core/hub.c

@@ -1320,9 +1320,7 @@ void hub_logout_log(struct hub_info* hub, struct hub_user* user)
 	list_append(hub->logout_info, loginfo);
 	while (list_size(hub->logout_info) > (size_t) hub->config->max_logout_log)
 	{
-		struct hub_logout_info* entry = list_get_first(hub->logout_info);
-		list_remove(hub->logout_info, entry);
-		hub_free(entry);
+		list_remove_first(hub->logout_info, hub_free);
 	}
 }
 

src/core/pluginloader.c

@@ -229,16 +229,16 @@ int plugin_initialize(struct hub_config* config, struct hub_info* hub)
 	return 0;
 }
 
+static void plugin_unload_ptr(void* ptr)
+{
+	struct plugin_handle* plugin = (struct plugin_handle*) ptr;
+	plugin_unload(plugin);
+}
+
+
 void plugin_shutdown(struct uhub_plugins* handle)
 {
-	struct plugin_handle* plugin = (struct plugin_handle*) list_get_first(handle->loaded);
-	while (plugin)
-	{
-		list_remove(handle->loaded, plugin);
-		plugin_unload(plugin);
-		plugin = (struct plugin_handle*) list_get_first(handle->loaded);
-	}
-
+	list_clear(handle->loaded, plugin_unload_ptr);
 	list_destroy(handle->loaded);
 }