RDMA/hns: fix memory leak in hns_roce_alloc_mr()

mainline inclusion
from mainline-v6.2-rc1
commit a115aa00
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6RP11
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a115aa00b18f7b8982b8f458149632caf64a862a



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When hns_roce_mr_enable() failed in hns_roce_alloc_mr(), mr_key is not
released. Compiled test only.

Fixes: 9b2cf76c ("RDMA/hns: Optimize PBL buffer allocation process")
Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>
Link: https://lore.kernel.org/r/20221119070834.48502-1-shaozhengchao@huawei.com


Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Zhou Juan <nnuzj07170227@163.com>