Minor off-by-one error in parsing the host:port argument. Would work

without the patch, but gives correcter error message with it.
Reviewed by:	Dean Gaudet, Jim Jagielski, Ken Coar


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@79559 13f79535-47bb-0310-9956-ffa450edef68