[gnome-control-center] screen: Don't print a warning with no backlight device

[Bastien Nocera <hadess src gnome org>]

commit 75e0fa8449fddb0835da9f2f9bf14fc463c3f740
Author: Bastien Nocera <hadess hadess net>
Date:   Thu Oct 11 13:13:32 2012 +0200

    screen: Don't print a warning with no backlight device

 panels/screen/cc-screen-panel.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/panels/screen/cc-screen-panel.c b/panels/screen/cc-screen-panel.c
index 1143dd9..77eb6af 100644
--- a/panels/screen/cc-screen-panel.c
+++ b/panels/screen/cc-screen-panel.c
@@ -232,7 +232,11 @@ get_brightness_cb (GObject *source_object, GAsyncResult *res, gpointer user_data
       gtk_widget_hide (WID ("brightness-frame"));
       g_object_set (G_OBJECT (WID ("turn-off-alignment")), "left-padding", 0, NULL);
 
-      g_warning ("Error getting brightness: %s", error->message);
+      if (error->message &&
+      	  strstr (error->message, "No backlight devices present") == NULL)
+        {
+          g_warning ("Error getting brightness: %s", error->message);
+        }
       g_error_free (error);
       return;
     }