Simplify code, no functional change.

This makes it clear that setting "mapRequired = true;" and "getMappingData().recycle();" call are always performed together.
Backport of r1604484, r1604496 from tomcat/trunk.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1604574 13f79535-47bb-0310-9956-ffa450edef68