[gnome-settings-daemon] trivial: Fix unused-variable compile warning

[Richard Hughes <rhughes src gnome org>]

commit c03be2bdba6a3e90ec0e0243a7f95504bd9ce8d9
Author: Richard Hughes <richard hughsie com>
Date:   Mon Mar 19 09:05:07 2012 +0000

    trivial: Fix unused-variable compile warning

 plugins/power/gsd-backlight-helper.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/plugins/power/gsd-backlight-helper.c b/plugins/power/gsd-backlight-helper.c
index 6d4dd01..259d49b 100644
--- a/plugins/power/gsd-backlight-helper.c
+++ b/plugins/power/gsd-backlight-helper.c
@@ -122,7 +122,6 @@ main (int argc, char *argv[])
 	gint uid;
 	gint euid;
 	guint retval = 0;
-	const gchar *pkexec_uid_str;
 	GError *error = NULL;
 	gboolean ret = FALSE;
 	gint set_brightness = -1;