check-accelerated: only cache result if successful

If it's unsuccessful it may be successful in a subsequent run,
so caching it can cause problems.

https://bugzilla.gnome.org/show_bug.cgi?id=672943

1 files changed, 6 insertions, 4 deletions

diff --git a/tools/gnome-session-check-accelerated.c b/tools/gnome-session-check-accelerated.c
index 2bd7993d..3f10778b 100644
--- a/tools/gnome-session-check-accelerated.c
+++ b/tools/gnome-session-check-accelerated.c
@@ -168,10 +168,12 @@ main (int argc, char **argv)
                         g_printerr ("gnome-session-check-accelerated: Helper exited with code %d\n", estatus);
         }
 
-        XChangeProperty (GDK_DISPLAY_XDISPLAY (display),
-                         rootwin,
-                         is_accelerated_atom,
-                         XA_CARDINAL, 32, PropModeReplace, (guchar *) &is_accelerated, 1);
+        if (is_accelerated) {
+            XChangeProperty (GDK_DISPLAY_XDISPLAY (display),
+                             rootwin,
+                             is_accelerated_atom,
+                             XA_CARDINAL, 32, PropModeReplace, (guchar *) &is_accelerated, 1);
+        }
 
         gdk_display_sync (display);