r->finfo isn't a scratch space, it contains information about r->filename

so create a scratch space when we need to scratch.

r->finfo.st_mode == 0 should be tested before other things involving
r->finfo.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@80083 13f79535-47bb-0310-9956-ffa450edef68