RDMA/ocrdma: Remove unneeded variable

Return status directly from function called.

Link: https://lore.kernel.org/r/20211215055421.441375-1-chi.minghao@zte.com.cn


Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Minghao Chi <chi.minghao@zte.com.cn>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>