Better param name (it's not a java.io.File).

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/bcel/trunk@1628400 13f79535-47bb-0310-9956-ffa450edef68
Better ivar name (it's not a java.io.File).

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/bcel/trunk@1628401 13f79535-47bb-0310-9956-ffa450edef68