[gnome-settings-daemon] power: Fix warning when keyboard backlight isn't available

[Bastien Nocera <hadess src gnome org>]

commit 7e5e7f3f9293cacfd8b8fd7442fc306d3530855f
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Oct 9 17:38:53 2013 +0200

    power: Fix warning when keyboard backlight isn't available
    
    When UPower doesn't offer keyboard backlight, we don't need the
    D-Bus proxy to access it, which fixes us trying to access
    the device when locking the screen.

 plugins/power/gsd-power-manager.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/plugins/power/gsd-power-manager.c b/plugins/power/gsd-power-manager.c
index 02af632..daedebf 100644
--- a/plugins/power/gsd-power-manager.c
+++ b/plugins/power/gsd-power-manager.c
@@ -2828,6 +2828,9 @@ power_keyboard_proxy_ready_cb (GObject             *source_object,
                     error->code != G_DBUS_ERROR_UNKNOWN_METHOD) {
                         g_warning ("Failed to get brightness: %s",
                                    error->message);
+                } else {
+                        /* Keyboard brightness is not available */
+                        g_clear_object (&manager->priv->upower_kdb_proxy);
                 }
                 g_error_free (error);
                 goto out;