No reason only one caller checks this. This properly blocks ODP
from the rereg flow if the device does not support ODP.

Link: https://lore.kernel.org/r/20201130075839.278575-3-leon@kernel.orgSigned-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>