RDMA/hns: Repacing 'dseg_len' by macros in fill_ext_sge_inl_data()

RDMA/hns: Repacing 'dseg_len' by macros in fill_ext_sge_inl_data()

[ Upstream commit 3b1f864c904915b3baebffb31ea05ee704b0df3c ]

The sge size is known to be constant, so it's unnecessary to use sizeof to
calculate.

Link: https://lore.kernel.org/r/20220922123315.3732205-11-xuhaoyue1@hisilicon.com
Signed-off-by: Luoyouming <luoyouming@huawei.com>
Signed-off-by: Haoyue Xu <xuhaoyue1@hisilicon.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Stable-dep-of: 8eaa6f7d569b ("RDMA/hns: Fix ext_sge num error when post send")
Signed-off-by: Sasha Levin <sashal@kernel.org>