Cleanup various clang warnings, use unique_ptrs in several places

Change-Id: I347904b25e51fcc7de14b1e72f1acd0f6ba26f3f
diff --git a/libs/hwui/RenderNode.cpp b/libs/hwui/RenderNode.cpp
index 7931b35..ad38a12 100644
--- a/libs/hwui/RenderNode.cpp
+++ b/libs/hwui/RenderNode.cpp
@@ -870,7 +870,7 @@
         return;
     }
 
-    const bool drawLayer = (mLayer && (&renderer != mLayer->renderer));
+    const bool drawLayer = (mLayer && (&renderer != mLayer->renderer.get()));
     // If we are updating the contents of mLayer, we don't want to apply any of
     // the RenderNode's properties to this issueOperations pass. Those will all
     // be applied when the layer is drawn, aka when this is true.