There is no need to return always zero for function which is not
supported.

Fixes: 9a443537 ("IB/hns: Add driver files for hns RoCE driver")
Link: https://lore.kernel.org/r/20191028155931.1114-3-kamalheib1@gmail.comSigned-off-by: NKamal Heib <kamalheib1@gmail.com>
Reviewed-by: NJason Gunthorpe <jgg@mellanox.com>
Signed-off-by: NJason Gunthorpe <jgg@mellanox.com>