hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5QETC
CVE: NA

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sp_make_share_k2u only supports vmalloc address now. Therefore, delete a
backup handle case.

Also master is guaranteed not be freed until master->node_list is emptied.
Signed-off-by: NGuo Mengqi <guomengqi3@huawei.com>