[gnome-settings-daemon] power: Don't try to unref a NULL pointer

[Rui Matos <rtcm src gnome org>]

commit abf8b334eb31edf6d22b7c86a2e2628972eed26d
Author: Rui Matos <tiagomatos gmail com>
Date:   Fri Nov 9 17:53:30 2012 +0100

    power: Don't try to unref a NULL pointer

 plugins/power/gsd-power-manager.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/plugins/power/gsd-power-manager.c b/plugins/power/gsd-power-manager.c
index 2bc36f2..26ac236 100644
--- a/plugins/power/gsd-power-manager.c
+++ b/plugins/power/gsd-power-manager.c
@@ -704,7 +704,7 @@ engine_recalculate_state_icon (GsdPowerManager *manager)
         icon = engine_get_icon (manager);
 
         if (g_icon_equal (icon, manager->priv->previous_icon)) {
-                g_object_unref (icon);
+                g_clear_object (&icon);
                 return FALSE;
         }