media: tw9910: Unregister subdevice with v4l2-async

As the tw9910 subdevice is registered through the v4l2-async framework,
use the v4l2-async provided function to register it.

Fixes: 7b20f325 ("media: i2c: tw9910: Remove soc_camera dependencies")
Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/i2c/tw9910.c

@@ -1001,7 +1001,7 @@ static int tw9910_remove(struct i2c_client *client)
 	if (priv->pdn_gpio)
 		gpiod_put(priv->pdn_gpio);
 	clk_put(priv->clk);
-	v4l2_device_unregister_subdev(&priv->subdev);
+	v4l2_async_unregister_subdev(&priv->subdev);
 
 	return 0;
 }