Merge 1781516 fro trunk:

htpasswd/htdbm: report the right limit when get_password()
overflows.

Submitted by: rjung
Reviewed by: rjung, covener, jailletc36


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1826888 13f79535-47bb-0310-9956-ffa450edef68