media: v4l: async: Clean up error handling in v4l2_async_match_notify

Add labels for error handling instead of doing it all in individual cases.
Prepare for more functionality in this function.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de> # imx6qp
Tested-by: Niklas Söderlund <niklas.soderlund@ragnatech.se> # rcar + adv746x
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Tested-by: Aishwarya Kothari <aishwarya.kothari@toradex.com> # Apalis i.MX6Q with TC358743
Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> # Renesas RZ/G2L SMARC
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

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

@@ -320,10 +320,8 @@ static int v4l2_async_match_notify(struct v4l2_async_notifier *notifier,
 		return ret;
 
 	ret = v4l2_async_nf_call_bound(notifier, sd, asc);
-	if (ret < 0) {
-		v4l2_device_unregister_subdev(sd);
-		return ret;
-	}
+	if (ret < 0)
+		goto err_unregister_subdev;
 
 	/*
 	 * Depending of the function of the entities involved, we may want to
@@ -332,11 +330,8 @@ static int v4l2_async_match_notify(struct v4l2_async_notifier *notifier,
 	 * pad).
 	 */
 	ret = v4l2_async_create_ancillary_links(notifier, sd);
-	if (ret) {
-		v4l2_async_nf_call_unbind(notifier, sd, asc);
-		v4l2_device_unregister_subdev(sd);
-		return ret;
-	}
+	if (ret)
+		goto err_call_unbind;
 
 	list_del(&asc->waiting_entry);
 	sd->asd = asc;
@@ -363,6 +358,14 @@ static int v4l2_async_match_notify(struct v4l2_async_notifier *notifier,
 	subdev_notifier->parent = notifier;
 
 	return v4l2_async_nf_try_all_subdevs(subdev_notifier);
+
+err_call_unbind:
+	v4l2_async_nf_call_unbind(notifier, sd, asc);
+
+err_unregister_subdev:
+	v4l2_device_unregister_subdev(sd);
+
+	return ret;
 }
 
 /* Test all async sub-devices in a notifier for a match. */