backport r1125877 from trunk

Fix various "variable 'x' set but not used" warnings.


Submitted By: sf
Reviewed By: ylavic, wrowe, covener



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1777403 13f79535-47bb-0310-9956-ffa450edef68