[gnome-control-center/gnome-3-6] background: Avoid accessing the panel if cancelled

[Bastien Nocera <hadess src gnome org>]

commit c3723cb9c84be856a02b099621cdcd8c58ca4190
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Jan 30 15:44:19 2013 +0100

    background: Avoid accessing the panel if cancelled
    
    If the background panel was closed, we shouldn't try to access
    panel's internals as it's already been freed.
    
    https://bugzilla.redhat.com/show_bug.cgi?id=880859

 panels/background/cc-background-panel.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/panels/background/cc-background-panel.c b/panels/background/cc-background-panel.c
index a05e519..c9b8d76 100644
--- a/panels/background/cc-background-panel.c
+++ b/panels/background/cc-background-panel.c
@@ -234,7 +234,7 @@ on_screenshot_finished (GObject *source,
                         gpointer user_data)
 {
   CcBackgroundPanel *panel = user_data;
-  CcBackgroundPanelPrivate *priv = panel->priv;
+  CcBackgroundPanelPrivate *priv;
   GError *error;
   GdkRectangle rect;
   GdkRectangle workarea_rect;
@@ -248,7 +248,7 @@ on_screenshot_finished (GObject *source,
   int primary;
 
   error = NULL;
-  result = g_dbus_connection_call_finish (panel->priv->connection,
+  result = g_dbus_connection_call_finish (G_DBUS_CONNECTION (source),
                                           res,
                                           &error);
 
@@ -265,6 +265,8 @@ on_screenshot_finished (GObject *source,
   }
   g_variant_unref (result);
 
+  priv = panel->priv;
+
   pixbuf = gdk_pixbuf_new_from_file (panel->priv->screenshot_path, &error);
   if (pixbuf == NULL)
     {