[gnome-photos/wip/facebook] item-manager: The collection path might have NULL items

[Álvaro Peña <alvaropg src gnome org>]

commit cd540ba95e2e14af4008963a9fd74f48e3511c6a
Author: Debarshi Ray <debarshir gnome org>
Date:   Thu Oct 31 17:14:27 2013 +0100

    item-manager: The collection path might have NULL items
    
    This fixes a CRITICAL when clicking the back button to come out of an
    album.

 src/photos-item-manager.c |   17 ++++++++++++++---
 1 files changed, 14 insertions(+), 3 deletions(-)
---
diff --git a/src/photos-item-manager.c b/src/photos-item-manager.c
index 3755032..cda801c 100644
--- a/src/photos-item-manager.c
+++ b/src/photos-item-manager.c
@@ -126,6 +126,13 @@ photos_item_manager_changes_pending (PhotosTrackerChangeMonitor *monitor, GHashT
 }
 
 
+static void
+photos_item_manager_collection_path_free_foreach (gpointer data, gpointer user_data)
+{
+  g_clear_object (&data);
+}
+
+
 static gboolean
 photos_item_manager_set_active_object (PhotosBaseManager *manager, GObject *object)
 {
@@ -190,8 +197,12 @@ photos_item_manager_dispose (GObject *object)
   PhotosItemManager *self = PHOTOS_ITEM_MANAGER (object);
   PhotosItemManagerPrivate *priv = self->priv;
 
-  g_queue_free_full (priv->collection_path, g_object_unref);
-  priv->collection_path = NULL;
+  if (priv->collection_path != NULL)
+    {
+      g_queue_foreach (priv->collection_path, photos_item_manager_collection_path_free_foreach, NULL);
+      g_queue_free (priv->collection_path);
+      priv->collection_path = NULL;
+    }
 
   g_clear_object (&priv->col_mngr);
   g_clear_object (&priv->monitor);
@@ -243,7 +254,7 @@ photos_item_manager_activate_previous_collection (PhotosItemManager *self)
 
   collection = G_OBJECT (g_queue_pop_head (priv->collection_path));
   photos_base_manager_set_active_object (priv->col_mngr, collection);
-  g_object_unref (collection);
+  g_clear_object (&collection);
 }