FROMLIST: v4l: async: Register sub-devices before calling bound callback

Register the sub-device before calling the notifier's bound callback.
Doing this the other way around is problematic as the struct v4l2_device
has not assigned for the sub-device yet and may be required by the bound
callback.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
(cherry picked from commit b1ba01634a3779612c760136710fc1de1f671b23)
https://git.linuxtv.org/sailus/media_tree.git/log/?h=010f7f4393fd
http://www.spinics.net/lists/linux-media/msg122688.html
Signed-off-by: Marc Herbert <marc.herbert@intel.com>

BUG=b:64133998
TEST=media device topology shows subdevs registered successfully
TEST=no camera regression

Change-Id: I5e8a7257461e4e773e8ec29720175fb1fc557f29
Reviewed-on: https://chromium-review.googlesource.com/693691
Commit-Ready: Tomasz Figa <tfiga@chromium.org>
Tested-by: Hyungwoo Yang <hyungwoo.yang@intel.com>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Jacob Chen <jacob2.chen@rock-chips.com>

Author: Sakari Ailus

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

@@ -134,13 +134,13 @@ static int v4l2_async_match_notify(struct v4l2_async_notifier *notifier,
 {
 	int ret;
 
-	ret = v4l2_async_notifier_call_bound(notifier, sd, asd);
+	ret = v4l2_device_register_subdev(notifier->v4l2_dev, sd);
 	if (ret < 0)
 		return ret;
 
-	ret = v4l2_device_register_subdev(notifier->v4l2_dev, sd);
+	ret = v4l2_async_notifier_call_bound(notifier, sd, asd);
 	if (ret < 0) {
-		v4l2_async_notifier_call_unbind(notifier, sd, asd);
+		v4l2_device_unregister_subdev(sd);
 		return ret;
 	}