- fix an off-by-1 on read() which I think I introduced in an

    earlier cleanup

- fix case where m->desc[] may be left unterminated

- note some code which is not multithread safe

Reviewed by:	Jim Jagielski, Marc Slemko


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@79730 13f79535-47bb-0310-9956-ffa450edef68