Request for patch review: Fix SSH high startup time on OSX when _SC_OPEN_MAX is high.

[likan_999.student at sina.com]

Recently I am seeing a problem that ssh takes a long time to start on OSX when _SC_OPEN_MAX is large. Here I come up with a bug report and a very simple and small patch for it (attached in the bug report):https://bugzilla.mindrot.org/show_bug.cgi?id=3049I am sending to this mailing because it comes with a patch so potentially it should cost less effort for OpenSSH developers (since they don't have to investigate and come up with a fix, if mine is not too badly written), therefore I am wondering if it deserves getting OpenSSH developers' attention a little earlier? Thanks.