[mutter/wayland] shaped-texture: Prevent a critical when setting a NULL cogl texture

[Jasper St. Pierre <jstpierre src gnome org>]

commit 0850da44d734496c873385fb0169f9e891d7edeb
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Tue Nov 26 12:35:12 2013 -0500

    shaped-texture: Prevent a critical when setting a NULL cogl texture

 src/compositor/meta-shaped-texture.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/compositor/meta-shaped-texture.c b/src/compositor/meta-shaped-texture.c
index 9a5e183..8d45d9b 100644
--- a/src/compositor/meta-shaped-texture.c
+++ b/src/compositor/meta-shaped-texture.c
@@ -227,10 +227,11 @@ set_cogl_texture (MetaShapedTexture *stex,
   if (priv->texture)
     cogl_object_unref (priv->texture);
 
-  priv->texture = cogl_object_ref (cogl_tex);
+  priv->texture = cogl_tex;
 
   if (cogl_tex != NULL)
     {
+      cogl_object_ref (cogl_tex);
       width = cogl_texture_get_width (COGL_TEXTURE (cogl_tex));
       height = cogl_texture_get_height (COGL_TEXTURE (cogl_tex));