[gnome-photos] base-manager: Use proper GHashTable API to get the count

[Debarshi Ray <debarshir src gnome org>]

commit 3def8d4c43803881ee9de77b4f3f81ed5c8ceca6
Author: Debarshi Ray <debarshir gnome org>
Date:   Thu Jun 18 15:28:09 2015 +0200

    base-manager: Use proper GHashTable API to get the count

 src/photos-base-manager.c |    5 +----
 1 files changed, 1 insertions(+), 4 deletions(-)
---
diff --git a/src/photos-base-manager.c b/src/photos-base-manager.c
index b836a45..928a768 100644
--- a/src/photos-base-manager.c
+++ b/src/photos-base-manager.c
@@ -384,12 +384,9 @@ photos_base_manager_get_objects (PhotosBaseManager *self)
 guint
 photos_base_manager_get_objects_count (PhotosBaseManager *self)
 {
-  GList *keys;
   guint count;
 
-  keys = g_hash_table_get_keys (self->priv->objects);
-  count = g_list_length (keys);
-  g_list_free (keys);
+  count = g_hash_table_size (self->priv->objects);
   return count;
 }