CHANGES related to r1842010.

I have choosen "unlikely" because this bug has been around for ever ([1]) and the pool is only "cleared"; that is to say, the data is still valid, but the memory *could* be re-used.

[1]: http://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/modules/dav/main/mod_dav.c?revision=85717&view=markup&sortby=date#l1610

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1846339 13f79535-47bb-0310-9956-ffa450edef68