Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=56908
Fix some potential resource leaks when reading jar files. Reported by Coverity Scan. Patch provided by Felix Schumacher.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1622342 13f79535-47bb-0310-9956-ffa450edef68