assert the IOE is correctcheck

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1529650 13f79535-47bb-0310-9956-ffa450edef68
remove unused var

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1529653 13f79535-47bb-0310-9956-ffa450edef68