vfio/mdev: Avoid masking error code to EBUSY

Instead of masking return error to -EBUSY, return actual error
returned by the driver.
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

drivers/vfio/mdev/mdev_core.c

@@ -141,7 +141,7 @@ static int mdev_device_remove_ops(struct mdev_device *mdev, bool force_remove)
 	 */
 	ret = parent->ops->remove(mdev);
 	if (ret && !force_remove)
-		return -EBUSY;
+		return ret;
 
 	sysfs_remove_groups(&mdev->dev.kobj, parent->ops->mdev_attr_groups);
 	return 0;