RDMA/hns: Avoid unncessary initialization

Some variables have been initialized when used. As a result, here removes
some unncessary initial assignment.

Link: https://lore.kernel.org/r/1599547944-30671-1-git-send-email-oulijun@huawei.com


Signed-off-by: Lijun Ou <oulijun@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>