If the user did not provide a long enough command buffer then the missing
bytes are forced to zero. There is no reason to check the length if a zero
value is OK.
Signed-off-by: NJason Gunthorpe <jgg@mellanox.com>
Signed-off-by: NLeon Romanovsky <leonro@mellanox.com>
Signed-off-by: NDoug Ledford <dledford@redhat.com>