mds: behave when passed NULL *need_issue
mds: behave when passed NULL *need_issue

Catch two cases: *need_issue = true at top of func
(if (first ...)), and when eval() call resets need_issue again.

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph