Ensure stream is closed

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/io/trunk@1441253 13f79535-47bb-0310-9956-ffa450edef68
Overriding synch. method

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/io/trunk@1441254 13f79535-47bb-0310-9956-ffa450edef68