CVE-2022-50775

In the Linux kernel, the following vulnerability has been resolved:

RDMA/hns: Fix refcount leak in hns_roce_mmap

rdma_user_mmap_entry_get_pgoff() takes the reference.
Add missing rdma_user_mmap_entry_put() to release the reference.

Acked-by Haoyue Xu <xuhaoyue1@hisilicon.com>