nvme-rdma: fix possible use-after-free in transport error_recovery work

mainline inclusion
from mainline-v5.17-rc3
commit b6bb1722
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/IADGNY?from=project-issue
CVE: CVE-2022-48788

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b6bb1722f34bbdbabed27acdceaf585d300c5fd2



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While nvme_rdma_submit_async_event_work is checking the ctrl and queue
state before preparing the AER command and scheduling io_work, in order
to fully prevent a race where this check is not reliable the error
recovery work must flush async_event_work before continuing to destroy
the admin queue after setting the ctrl state to RESETTING such that
there is no race .submit_async_event and the error recovery handler
itself changing the ctrl state.

Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: He Yujie <coka.heyujie@huawei.com>