RDMA/hns: Fix the wrong value of rnr_retry when querying qp

The rnr_retry returned to the user is not correct, it should be got from
another fields in QPC.

Fixes: bfe86035 ("RDMA/hns: Fix cast from or to restricted __le32 for driver")
Link: https://lore.kernel.org/r/1600509802-44382-7-git-send-email-liweihang@huawei.com


Signed-off-by: Wenpeng Liang <liangwenpeng@huawei.com>
Signed-off-by: Weihang Li <liweihang@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>