Check if SC is valid before calling setTransparentRegionHint

Fixes: 179863777
Test: Steps from bug
Change-Id: I915a3f8cdef3e21d33e9458c35db7259ed88ca5d

core/java/android/view/ViewRootImpl.java

@@ -3070,8 +3070,10 @@ public final class ViewRootImpl implements ViewParent,
                     // via the WM relayout code path. We probably eventually
                     // want to synchronize transparent region hint changes
                     // with draws.
-                    mTransaction.setTransparentRegionHint(getSurfaceControl(),
-                        mTransparentRegion).apply();
+                    SurfaceControl sc = getSurfaceControl();
+                    if (sc.isValid()) {
+                        mTransaction.setTransparentRegionHint(sc, mTransparentRegion).apply();
+                    }
                 }
             }