The mtk_iommu and virtio drivers have places in the ->attach_dev callback
functions that return hardcode errnos instead of the returned values, but
callers of these ->attach_dv callback functions may care. Propagate them
directly without the extra conversions.

Link: https://lore.kernel.org/r/ca8c5a447b87002334f83325f28823008b4ce420.1666042873.git.nicolinc@nvidia.comReviewed-by: NKevin Tian <kevin.tian@intel.com>
Reviewed-by: NJean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: NJason Gunthorpe <jgg@nvidia.com>
Reviewed-by: NYong Wu <yong.wu@mediatek.com>
Signed-off-by: NNicolin Chen <nicolinc@nvidia.com>
Signed-off-by: NJason Gunthorpe <jgg@nvidia.com>