All functions now return linux error codes. Propagate the return from
these functions as opposed to converting them to generic values.

Link: https://lore.kernel.org/r/20220217151851.1518-3-shiraz.saleem@intel.comSigned-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>