[mutter/wayland] display: Tweak code to work around a compiler warning

[Florian Müllner <fmuellner src gnome org>]

commit 17f48baf3a08b96cb1cb9a4147aa41ee2e0f73cc
Author: Florian Müllner <fmuellner gnome org>
Date:   Tue Nov 19 19:44:30 2013 +0100

    display: Tweak code to work around a compiler warning
    
    The compiler is not quite smart enough to figure out that the condition
    for setting the "compositor" variable matches a later condition for
    accessing it, so express this in a way the compiler will understand.

 src/core/display.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/core/display.c b/src/core/display.c
index 8e90af0..2a6779d 100644
--- a/src/core/display.c
+++ b/src/core/display.c
@@ -2042,7 +2042,7 @@ meta_display_handle_event (MetaDisplay        *display,
   /* XXX -- we need to fill this in properly at some point... */
   gboolean frame_was_receiver = FALSE;
 #ifdef HAVE_WAYLAND
-  MetaWaylandCompositor *compositor;
+  MetaWaylandCompositor *compositor = NULL;
 
   if (meta_is_wayland_compositor ())
     {
@@ -2293,7 +2293,7 @@ meta_display_handle_event (MetaDisplay        *display,
     }
 
 #ifdef HAVE_WAYLAND
-  if (meta_is_wayland_compositor () && (display->grab_op == META_GRAB_OP_NONE))
+  if (compositor && (display->grab_op == META_GRAB_OP_NONE))
     {
       if (meta_wayland_compositor_handle_event (compositor, event))
         return TRUE;