RDMA/hns: Init the variable at the suitable place

mainline inclusion
from mainline-for-linus
commit 6f4f5cf9
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5CHIG
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git/commit/?id=6f4f5cf9823387acc4f52e3d30f96b879acdff37

----------------------------------------------------------------------

Assigning a value to ret in the init statement of a for-loop makes the
code less readable.

Link: https://lore.kernel.org/r/20220409083254.9696-6-liangwenpeng@huawei.com


Signed-off-by: Haoyue Xu <xuhaoyue1@hisilicon.com>
Signed-off-by: Wenpeng Liang <liangwenpeng@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Zhengfeng Luo <luozhengfeng@h-partners.com>
Reviewed-by: Yangyang Li <liyangyang20@huawei.com>
Reviewed-by: Yue Haibing <yuehaibing@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>