[gnome-control-center] shell: Fix entering the same panel twice

[Bastien Nocera <hadess src gnome org>]

commit b3287e1b971db4955f2914be9f6ff69a89ad99dd
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Sep 25 21:23:57 2012 +0200

    shell: Fix entering the same panel twice
    
    Manually this time.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=684812

 shell/gnome-control-center.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/shell/gnome-control-center.c b/shell/gnome-control-center.c
index 1e45188..bcd34da 100644
--- a/shell/gnome-control-center.c
+++ b/shell/gnome-control-center.c
@@ -278,6 +278,7 @@ shell_show_overview_page (GnomeControlCenter *center)
     notebook_remove_page (priv->notebook, priv->current_panel_box);
   priv->current_panel = NULL;
   priv->current_panel_box = NULL;
+  g_clear_pointer (&priv->current_panel_id, g_free);
 
   /* clear the search text */
   g_free (priv->filter_string);
@@ -965,7 +966,7 @@ _shell_set_active_panel_from_id (CcShell      *shell,
       return TRUE;
     }
 
-  g_free (priv->current_panel_id);
+  g_clear_pointer (&priv->current_panel_id, g_free);
 
   /* clear any custom widgets */
   _shell_remove_all_custom_widgets (priv);