ocfs2: kill EBUSY from dlmfs_evict_inode

When unlinking a dlmfs, first it will invoke dlmfs_unlink(), and then
invoke dlmfs_evict_inode(), user_dlm_destroy_lock() is invoked in both
places, the second one from dlmfs_evict_inode() will get EBUSY error
because USER_LOCK_IN_TEARDOWN is already set in lockres.  This doesn't
affect any function, just the error log is annoying.

Link: https://lkml.kernel.org/r/20220607171226.86672-1-junxiao.bi@oracle.com
Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>