ocfs2/dlm: cleanup unused function __dlm_wait_on_lockres_flags_set

__dlm_wait_on_lockres_flags_set() is declared but not implemented and
used.  So remove it.

Signed-off-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>