net: hns3: fix debugfs concurrency issue between kfree buffer and read

mainline inclusion
from mainline-v6.6-rc1
commit c295160b
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7YRUW
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c295160b1d95e885f1af4586a221cb221d232d10



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Now in hns3_dbg_uninit(), there may be concurrency between
kfree buffer and read, it may result in memory error.

Moving debugfs_remove_recursive() in front of kfree buffer to ensure
they don't happen at the same time.

Fixes: 5e69ea7e ("net: hns3: refactor the debugfs process")
Signed-off-by: Hao Chen <chenhao418@huawei.com>
Signed-off-by: Jijie Shao <shaojijie@huawei.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Jiantao Xiao <xiaojiantao1@h-partners.com>