v2 of sterlings segv fix

always initialize the extension_info hash rather than checking that it is
!= NULL
PR:
Obtained from:
Submitted by:	John Sterling <sterling@covalent.net>
Reviewed by: dougm


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@90510 13f79535-47bb-0310-9956-ffa450edef68