Ensure that the buffer returned by ht_time is always properly null

terminated.

Submitted by:	Marc Slemko
Reviewed by:    Martin Kraemer, Mark J Cox, Dean Gaudet, Randy Terbush


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@79915 13f79535-47bb-0310-9956-ffa450edef68