Fix logspam NPE.

Harmless but spammy.

Bug: 37622525
Test: Repro from bug.
Change-Id: I7fa2404fddb0c62efdd4553d5c61e92ae8f3a876
diff --git a/core/java/android/view/SurfaceView.java b/core/java/android/view/SurfaceView.java
index 9d40895..f539752 100644
--- a/core/java/android/view/SurfaceView.java
+++ b/core/java/android/view/SurfaceView.java
@@ -711,6 +711,10 @@
                     mTranslator.translateRectInAppWindowToScreen(mScreenRect);
                 }
 
+                if (mSurfaceControl == null) {
+                    return;
+                }
+
                 if (!isHardwareAccelerated() || !mRtHandlingPositionUpdates) {
                     try {
                         if (DEBUG) Log.d(TAG, String.format("%d updateSurfacePosition UI, " +