htdigest: Fix possible overflow in command line processing. htdigest is not

supposed to be suid save, therefore not treated as a security issue.

CVE-2005-1344
Submitted by: Adam Conrad
Reviewed by: Stefan Fritsch


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@826506 13f79535-47bb-0310-9956-ffa450edef68