Allow for backwards compatibility for the md5 check...

if we've read the slotmem data and we are at EOF, then
don't bother checking the md5 and assume all is OK.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1540178 13f79535-47bb-0310-9956-ffa450edef68