[mutter] display: trivial code clean up

[Rui Matos <rtcm src gnome org>]

commit 7ba6503e9b0ae51d9baf5fe2e6eeefc6866ba319
Author: Rui Matos <tiagomatos gmail com>
Date:   Wed Sep 14 23:23:08 2011 +0100

    display: trivial code clean up
    
    Remove redundant if statement.

 src/core/display.c |    7 ++-----
 1 files changed, 2 insertions(+), 5 deletions(-)
---
diff --git a/src/core/display.c b/src/core/display.c
index 9e866aa..095cbc3 100644
--- a/src/core/display.c
+++ b/src/core/display.c
@@ -2294,11 +2294,8 @@ event_callback (XEvent   *event,
         screen = meta_display_screen_for_root (display,
                                                event->xconfigure.event);
         if (screen)
-          {
-            if (screen)
-              meta_stack_tracker_reparent_event (screen->stack_tracker,
-                                                 &event->xreparent);
-          }
+          meta_stack_tracker_reparent_event (screen->stack_tracker,
+                                             &event->xreparent);
       }
       break;
     case ConfigureNotify: