RDMA/hns: Fix memory leak in free_mr_exit() and free_mr_init()

driver inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6GT7F



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Reserved QPs and Reserved PD memory was leaked in free_mr_exit().
When a reserved QP fails to be created, the memory of the remaining
created reserved QPs is leaked.

Fixes: e89e2d3b ("RDMA/hns: Fix gid idx issue caused by free mr")
Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>