Refcount RenderNode

Change-Id: I7a86db8acc2b78ef33d987a43a119f5933d7d752
diff --git a/libs/hwui/OpenGLRenderer.cpp b/libs/hwui/OpenGLRenderer.cpp
index e1f484d..9dbcd36 100644
--- a/libs/hwui/OpenGLRenderer.cpp
+++ b/libs/hwui/OpenGLRenderer.cpp
@@ -537,7 +537,7 @@
 
 bool OpenGLRenderer::updateLayer(Layer* layer, bool inFrame) {
     if (layer->deferredUpdateScheduled && layer->renderer &&
-            layer->displayList && layer->displayList->isRenderable()) {
+            layer->displayList.get() && layer->displayList->isRenderable()) {
         ATRACE_CALL();
 
         Rect& dirty = layer->dirtyRect;