[mutter] shaped-texture: Clean up texture regions

[Jonas Ådahl <jadahl src gnome org>]

commit 8200995fdbf04b2763d33cd30d7c8174eebc1736
Author: Jonas Ådahl <jadahl gmail com>
Date:   Sat Oct 20 15:47:50 2018 +0200

    shaped-texture: Clean up texture regions
    
    We allocated texture regions, but didn't free them when finished,
    causing a leak.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/issues/653

 src/compositor/meta-shaped-texture.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/src/compositor/meta-shaped-texture.c b/src/compositor/meta-shaped-texture.c
index 5328a919e..cd151a28e 100644
--- a/src/compositor/meta-shaped-texture.c
+++ b/src/compositor/meta-shaped-texture.c
@@ -516,6 +516,7 @@ meta_shaped_texture_paint (ClutterActor *actor)
     }
   else
     {
+      opaque_tex_region = NULL;
       use_opaque_region = FALSE;
     }
 
@@ -659,6 +660,8 @@ meta_shaped_texture_paint (ClutterActor *actor)
         }
     }
 
+  g_clear_pointer (&clip_tex_region, cairo_region_destroy);
+  g_clear_pointer (&opaque_tex_region, cairo_region_destroy);
   g_clear_pointer (&blended_tex_region, cairo_region_destroy);
 }