media: atomisp: add missing media_device_cleanup() in atomisp_unregister_entities()

After the commit 9832e155 ("[media] media-device: split media
initialization and registration"), calling media_device_cleanup()
is needed it seems. However, currently it is missing for the module
unload path.

Note that for the probe failure path, it is already added in
atomisp_register_entities().

This patch adds the missing call of media_device_cleanup() in
atomisp_unregister_entities().

Fixes: a49d2536 ("staging/atomisp: Add support for the Intel IPU v2")
Signed-off-by: Tsuchiya Yuto <kitakar@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/atomisp/pci/atomisp_v4l2.c

@@ -1182,6 +1182,7 @@ static void atomisp_unregister_entities(struct atomisp_device *isp)
 
 	v4l2_device_unregister(&isp->v4l2_dev);
 	media_device_unregister(&isp->media_dev);
+	media_device_cleanup(&isp->media_dev);
 }
 
 static int atomisp_register_entities(struct atomisp_device *isp)