[media] v4l2-dev: don't debug poll unless the debug level > 2

Some applications poll a lot, so prevent the poll message from flooding
the log.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/v4l2-core/v4l2-dev.c

@@ -335,7 +335,7 @@ static unsigned int v4l2_poll(struct file *filp, struct poll_table_struct *poll)
 		return DEFAULT_POLLMASK;
 	if (video_is_registered(vdev))
 		res = vdev->fops->poll(filp, poll);
-	if (vdev->debug)
+	if (vdev->debug > 2)
 		printk(KERN_DEBUG "%s: poll: %08x\n",
 			video_device_node_name(vdev), res);
 	return res;