Make sure the JAR file stream is closed.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1516470 13f79535-47bb-0310-9956-ffa450edef68
Statements unnecessarily nested within else clause.

git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1516471 13f79535-47bb-0310-9956-ffa450edef68