[metacity] compositor-xrender: fix memory leaks

[Alberts Muktupāvels <muktupavels src gnome org>]

commit b810742d76f19a553b24744f0008fcca86b59547
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Sat Sep 12 16:23:55 2020 +0300

    compositor-xrender: fix memory leaks

 src/compositor/meta-compositor-xrender.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
---
diff --git a/src/compositor/meta-compositor-xrender.c b/src/compositor/meta-compositor-xrender.c
index 6acd3297..650b483b 100644
--- a/src/compositor/meta-compositor-xrender.c
+++ b/src/compositor/meta-compositor-xrender.c
@@ -920,6 +920,18 @@ meta_compositor_xrender_finalize (GObject *object)
   if (xrender->root_picture)
     XRenderFreePicture (xdisplay, xrender->root_picture);
 
+  if (xrender->root_buffer)
+    {
+      XRenderFreePicture (xdisplay, xrender->root_buffer);
+      xrender->root_buffer = None;
+    }
+
+  if (xrender->root_tile)
+    {
+      XRenderFreePicture (xdisplay, xrender->root_tile);
+      xrender->root_tile = None;
+    }
+
   if (xrender->have_shadows)
     {
       int i;