Don't use two different variables to refer to mSnapshot.

Change-Id: Ie4a0616d2fe0b040ac14b734a9ddf77bf1f35b0c
diff --git a/libs/hwui/OpenGLRenderer.cpp b/libs/hwui/OpenGLRenderer.cpp
index 38e153f..faad297 100644
--- a/libs/hwui/OpenGLRenderer.cpp
+++ b/libs/hwui/OpenGLRenderer.cpp
@@ -357,7 +357,7 @@
         mSnapshot->transform->mapRect(bounds);
 
         // Layers only make sense if they are in the framebuffer's bounds
-        bounds.intersect(*mSnapshot->clipRect);
+        bounds.intersect(*snapshot->clipRect);
 
         // When the layer is not an FBO, we may use glCopyTexImage so we
         // need to make sure the layer does not extend outside the bounds