vdpa/mlx5: clean up indenting in handle_ctrl_vlan()

These lines were supposed to be indented.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Message-Id: <Yp71IYMP+QfuCJ8t@kili>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Eli Cohen <elic@nvidia.com>
Acked-by: Si-Wei Liu <si-wei.liu@oracle.com>