[metacity] compositor: simplify win_extents

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 8765904158d07abae6a6c167daeba61941fd847c
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sat Mar 4 18:36:27 2017 +0200

    compositor: simplify win_extents

 src/compositor/meta-compositor-xrender.c |    5 +----
 1 files changed, 1 insertions(+), 4 deletions(-)
---
diff --git a/src/compositor/meta-compositor-xrender.c b/src/compositor/meta-compositor-xrender.c
index 94a9966..3119374 100644
--- a/src/compositor/meta-compositor-xrender.c
+++ b/src/compositor/meta-compositor-xrender.c
@@ -1043,9 +1043,6 @@ static XserverRegion
 win_extents (MetaCompositorXRender *xrender,
              MetaCompWindow        *cw)
 {
-  MetaScreen *screen = cw->screen;
-  MetaDisplay *display = meta_screen_get_display (screen);
-  Display *xdisplay = meta_display_get_xdisplay (display);
   XRectangle r;
 
   r.x = cw->attrs.x;
@@ -1110,7 +1107,7 @@ win_extents (MetaCompositorXRender *xrender,
         r.height = sr.y + sr.height - r.y;
     }
 
-  return XFixesCreateRegion (xdisplay, &r, 1);
+  return XFixesCreateRegion (xrender->xdisplay, &r, 1);
 }
 
 static XserverRegion