Fix a bug introduced by a bug fix during the 1.2 betas: if there are

multiple <Directory>s that match, all are applied... that's the bug that
was fixed during 1.2bX.  But it didn't reset this_conf to NULL, so as
soon as one match was found, it would be merged over and over again.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@78846 13f79535-47bb-0310-9956-ffa450edef68