Merge "Check if layer is created in detachSurfaceTexture"

void DeferredLayerUpdater::detachSurfaceTexture() {

    if (mSurfaceTexture.get()) {

        if (mLayer->getApi() == Layer::Api::OpenGL) {

        if (mLayerApi == Layer::Api::OpenGL) {

            status_t err = mSurfaceTexture->detachFromContext();

            if (err != 0) {

                // TODO: Elevate to fatal exception

                ALOGE("Failed to detach SurfaceTexture from context %d", err);

            }

            if (mLayer) {

                static_cast<GlLayer*>(mLayer)->clearTexture();

            }

        }

        mSurfaceTexture = nullptr;

    }

}