remove a bit of useless code from worker and event MPMs

PR: 41193
Submitted by: Davi Arnaut <davi haxent.com.br>
Reviewed by: trawick


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@490030 13f79535-47bb-0310-9956-ffa450edef68