background: fix various leaks

Fix various leaks found by valgrind.

panels/background/bg-colors-source.c

@@ -105,6 +105,8 @@ bg_colors_source_init (BgColorsSource *self)
                                          0, pixbuf,
                                          1, item,
                                          -1);
+
+      g_object_unref (pixbuf);
     }
 
   g_object_unref (thumb_factory);

panels/background/bg-flickr-source.c

@@ -116,6 +116,7 @@ _view_items_added_cb (SwClientItemView *item_view,
                                          0, pixbuf,
                                          1, item,
                                          -1);
+      g_object_unref (pixbuf);
     }
 }
 

panels/background/bg-pictures-source.c

@@ -198,6 +198,7 @@ file_info_async_ready (GObject      *source,
           gtk_tree_path_free (tree_path);
 
           g_free (filename);
+          g_object_unref (pixbuf);
         }
     }
 

panels/background/cc-background-panel.c

@@ -326,6 +326,7 @@ backgrounds_changed_cb (GtkIconView       *icon_view,
 
   gtk_tree_model_get_iter (model, &iter, (GtkTreePath*) list->data);
 
+  g_list_foreach (list, (GFunc)gtk_tree_path_free, NULL);
   g_list_free (list);
 
   gtk_tree_model_get (model, &iter, 1, &item, -1);
@@ -457,7 +458,6 @@ preview_expose_cb (GtkWidget         *widget,
                                             priv->thumb_factory,
                                             allocation.width,
                                             allocation.height);
-      g_object_ref (pixbuf);
     }
 
   if (pixbuf)

panels/background/gnome-wp-info.c

@@ -84,4 +84,6 @@ void gnome_wp_info_free (GnomeWPInfo * info) {
   g_free (info->thumburi);
   g_free (info->name);
   g_free (info->mime_type);
+
+  g_free (info);
 }

panels/background/gnome-wp-item.c

@@ -183,6 +183,8 @@ void gnome_wp_item_free (GnomeWPItem * item) {
 
   gtk_tree_row_reference_free (item->rowref);
 
+  g_free (item->source_url);
+
   g_free (item);
 }
 
@@ -256,7 +258,7 @@ void gnome_wp_item_update_description (GnomeWPItem * item) {
   if (!strcmp (item->filename, "(none)")) {
     item->description = g_strdup (item->name);
   } else {
-    const gchar *description;
+    gchar *description;
     gchar *size;
     gchar *dirname = g_path_get_dirname (item->filename);
 
@@ -266,9 +268,9 @@ void gnome_wp_item_update_description (GnomeWPItem * item) {
     if (strcmp (item->fileinfo->mime_type, "application/xml") == 0)
       {
         if (gnome_bg_changes_with_time (item->bg))
-          description = _("Slide Show");
+          description = g_strdup (_("Slide Show"));
         else if (item->width > 0 && item->height > 0)
-          description = _("Image");
+          description = g_strdup (_("Image"));
       }
     else
       description = g_content_type_get_description (item->fileinfo->mime_type);
@@ -311,5 +313,6 @@ void gnome_wp_item_update_description (GnomeWPItem * item) {
 
     g_free (size);
     g_free (dirname);
+    g_free (description);
   }
 }

panels/background/gnome-wp-xml.c

@@ -333,6 +333,7 @@ static void gnome_wp_xml_load_from_dir (const gchar *path,
   gnome_wp_xml_add_monitor (directory, data);
 
   g_object_unref (directory);
+  g_object_unref (enumerator);
 }
 
 void gnome_wp_xml_load_list (GnomeWpXml *data) {