filelock: Fix fcntl/close race recovery compat path

JIRA: https://issues.redhat.com/browse/RHEL-50898

CVE: CVE-2024-41020

Conflicts: Conflict is caused by absence of upstream commit 4ca52f539865 (filelock: have fs/locks.c deal with file_lock_core directly)

Signed-off-by: Pavel Reichl preichl@redhat.com