Fix some bogosity dealing with the mapping from process and thread

numbers to ids and back.

This gets mpmt_pthread working again (it was hanging/looping before this).
I don't know whether or not dexter had the same problem.

Submitted by:	Jeff Trawick and Greg Ames


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@87955 13f79535-47bb-0310-9956-ffa450edef68