[media] adv7180: Remove unnecessary v4l2_device_unregister_subdev() from probe error path

The device can't possibly be registered at this point, so no need to to call
v4l2_device_unregister_subdev().
Signed-off-by: NLars-Peter Clausen <lars@metafoo.de>
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/i2c/adv7180.c

@@ -616,7 +616,6 @@ static int adv7180_probe(struct i2c_client *client,
 err_free_ctrl:
 	adv7180_exit_controls(state);
 err_unreg_subdev:
-	v4l2_device_unregister_subdev(sd);
 	mutex_destroy(&state->mutex);
 err:
 	printk(KERN_ERR KBUILD_MODNAME ": Failed to probe: %d\n", ret);