[gnome-screensaver] Avoid a warning

[Matthias Clasen <matthiasc src gnome org>]

commit ed0f48e25c27c5e787dbf1134d7815afa2be7525
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Dec 22 12:08:31 2010 -0500

    Avoid a warning

 src/gnome-screensaver-preferences.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/gnome-screensaver-preferences.c b/src/gnome-screensaver-preferences.c
index b98bbb8..91a7654 100644
--- a/src/gnome-screensaver-preferences.c
+++ b/src/gnome-screensaver-preferences.c
@@ -430,7 +430,7 @@ response_cb (GtkWidget *widget,
 
                 error = NULL;
 
-                context = gdk_app_launch_context_new ();
+                context = (GAppLaunchContext*)gdk_app_launch_context_new ();
                 appinfo = g_app_info_create_from_commandline (GPM_COMMAND, "Power preferences", 0, &error);
                 if (appinfo) {
                         g_app_info_launch (appinfo, NULL, context, &error);