Properly close Surface when done.

Surface.destroy was not being called. Leading to warning from
StrictMode.

Fixes bug 8388527.

Change-Id: I472fb57ed2c3f6389e53d8f020f3b22b2d0740c8

services/java/com/android/server/wm/ScreenRotationAnimation.java

@@ -234,6 +234,7 @@ class ScreenRotationAnimation {
                 mSurfaceControl.setLayer(FREEZE_LAYER + 1);
                 mSurfaceControl.setAlpha(0);
                 mSurfaceControl.show();
+                sur.destroy();
             } catch (SurfaceControl.OutOfResourcesException e) {
                 Slog.w(TAG, "Unable to allocate freeze surface", e);
             }