[media] gspca: Use req_events in poll

static unsigned int dev_poll(struct file *file, poll_table *wait)

{

	struct gspca_dev *gspca_dev = video_drvdata(file);

	int ret;

	unsigned long req_events = poll_requested_events(wait);

	int ret = 0;

	PDEBUG(D_FRAM, "poll");

	poll_wait(file, &gspca_dev->wq, wait);

	if (req_events & POLLPRI)

		ret |= v4l2_ctrl_poll(file, wait);

	if (req_events & (POLLIN | POLLRDNORM)) {

		/* if reqbufs is not done, the user would use read() */

		if (gspca_dev->memory == GSPCA_MEMORY_NO) {

		ret = read_alloc(gspca_dev, file);

		if (ret != 0)

			return POLLERR;

			if (read_alloc(gspca_dev, file) != 0) {

				ret |= POLLERR;

				goto out;

			}

		}

	if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0)

		return POLLERR;

		poll_wait(file, &gspca_dev->wq, wait);

		/* check if an image has been received */

		if (mutex_lock_interruptible(&gspca_dev->queue_lock) != 0) {

			ret |= POLLERR;

			goto out;

		}

		if (gspca_dev->fr_o != atomic_read(&gspca_dev->fr_i))

		ret = POLLIN | POLLRDNORM;	/* yes */

	else

		ret = 0;

	ret |= v4l2_ctrl_poll(file, wait);

			ret |= POLLIN | POLLRDNORM;

		mutex_unlock(&gspca_dev->queue_lock);

	}

out:

	if (!gspca_dev->present)

		return POLLHUP;

		ret |= POLLHUP;

	return ret;

}