media: v4l2-fwnode: ignore endpoints that have no remote port parent

Documentation/devicetree/bindings/media/video-interfaces.txt states that
the 'remote-endpoint' property is optional.

So v4l2_async_notifier_fwnode_parse_endpoint() should not return error
if the endpoint has no remote port parent. Just ignore the endpoint,
skip adding an asd to the notifier and return 0.
__v4l2_async_notifier_parse_fwnode_endpoints() will then continue
parsing the remaining port endpoints of the device.
Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

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

@@ -367,7 +367,7 @@ static int v4l2_async_notifier_fwnode_parse_endpoint(
 		fwnode_graph_get_remote_port_parent(endpoint);
 	if (!asd->match.fwnode) {
 		dev_warn(dev, "bad remote port parent\n");
-		ret = -EINVAL;
+		ret = -ENOTCONN;
 		goto out_err;
 	}