[DLM] fix userland unlock

This patch fixes the userland DLM unlock code so that it correctly returns the
address of the userland lock status block in its completion AST.

It fixes bug #201348

Patrick
Signed-Off-By: NPatrick Caulfield <pcaulfie@redhat.com>
Signed-off-by: NSteven Whitehouse <swhiteho@redhat.com>

fs/dlm/lock.c

@@ -3699,6 +3699,7 @@ int dlm_user_unlock(struct dlm_ls *ls, struct dlm_user_args *ua_tmp,
 	if (lvb_in && ua->lksb.sb_lvbptr)
 		memcpy(ua->lksb.sb_lvbptr, lvb_in, DLM_USER_LVB_LEN);
 	ua->castparam = ua_tmp->castparam;
+	ua->user_lksb = ua_tmp->user_lksb;
 
 	error = set_unlock_args(flags, ua, &args);
 	if (error)