media: usb: go7007: s2250-board: add missed i2c_unregister_device

The driver forgets to call i2c_unregister_device in remove like what is
done in probe failure.
Add the missed call to fix it.
Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/usb/go7007/s2250-board.c

@@ -607,6 +607,7 @@ static int s2250_remove(struct i2c_client *client)
 {
 	struct s2250 *state = to_state(i2c_get_clientdata(client));
 
+	i2c_unregister_device(state->audio);
 	v4l2_device_unregister_subdev(&state->sd);
 	v4l2_ctrl_handler_free(&state->hdl);
 	kfree(state);