V4L2_CTRL_FLAG_GRABBED
if (qctrl->flags & V4L2_CTRL_FLAG_GRABBED)
if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)) {
if (set && (ctrl->flags & V4L2_CTRL_FLAG_GRABBED))
V4L2_CTRL_FLAG_GRABBED |
if (ctrl->flags & V4L2_CTRL_FLAG_GRABBED)