Fix filter registration so that the appropriate list of

registrations is actually modified.  This allows Apache to server
pages again.  (Before this, every ap_add_filter() silently failed
and so output content went to the bit bucket.)

Also, repair some comments and un-namespace-protect a now-static
function.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86255 13f79535-47bb-0310-9956-ffa450edef68