The request_module() call is internally wrapped by CONFIG_MODULE,
so there is no need to check it in our RDMA code too.

Refactor to simplify the code.
Reviewed-by: NMark Bloch <markb@mellanox.com>
Signed-off-by: NLeon Romanovsky <leonro@mellanox.com>
Signed-off-by: NJason Gunthorpe <jgg@mellanox.com>