PixelFormatInfo::info() would log a warning message if the PixelFormat was invalid when called from the isRaw() function. Add a validity test in isRaw() to avoid this warning message. Signed-off-by: Naushir Patuck <naush@raspberrypi.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>