https://issues.apache.org/jira/browse/MTOMCAT-211
Followup to r1539920
Introduce a local variable to cache the object created by expandFile.getParentFile() call.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/maven-plugin/trunk@1539956 13f79535-47bb-0310-9956-ffa450edef68