Fix NPE in setSurfaceTexure

        }

        mSurface = surfaceTexture;

        // If the view is visible, update the listener in the new surface to use

        // the existing listener in the view.

        if (((mViewFlags & VISIBILITY_MASK) == VISIBLE)) {

        /*

         * If the view is visible and we already made a layer, update the

         * listener in the new surface to use the existing listener in the view.

         * Otherwise this will be called when the view becomes visible or the

         * layer is created

         */

        if (((mViewFlags & VISIBILITY_MASK) == VISIBLE) && mLayer != null) {

            mSurface.setOnFrameAvailableListener(mUpdateListener, mAttachInfo.mHandler);

        }

        mUpdateSurface = true;