If an OpenGL error occurred before starting the video painter, it would fail to do so. This patch simply makes sure the OpenGL error flag is cleared before checking for GL errors that would occur in QVideoSurfaceArbFpPainter's code. Change-Id: I2eacf6db03cb290adf00a9faf11145c7a6ade565 Reviewed-by: Christian Stromme <christian.stromme@digia.com>