[gnome-control-center] sound: fix potential memory corruption

[Lionel Landwerlin <llandwerlin src gnome org>]

commit 1ac3c47a33722fa01249eb8c31bd83ba0684b0d2
Author: Lionel Landwerlin <llandwerlin gmail com>
Date:   Mon Apr 8 13:43:24 2013 +0100

    sound: fix potential memory corruption
    
    https://bugzilla.gnome.org/show_bug.cgi?id=697555

 panels/sound/gvc-sound-theme-chooser.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/panels/sound/gvc-sound-theme-chooser.c b/panels/sound/gvc-sound-theme-chooser.c
index 2aa68fc..79f1c65 100644
--- a/panels/sound/gvc-sound-theme-chooser.c
+++ b/panels/sound/gvc-sound-theme-chooser.c
@@ -671,7 +671,7 @@ update_theme (GvcSoundThemeChooser *chooser)
         }
 
         if (g_strcmp0 (last_theme, chooser->priv->current_theme) != 0) {
-                g_free (chooser->priv->current_parent);
+                g_clear_pointer (&chooser->priv->current_parent, g_free);
                 if (load_theme_name (chooser->priv->current_theme,
                                      &chooser->priv->current_parent) == FALSE) {
                         g_free (chooser->priv->current_theme);