fix false test failure

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@985453 13f79535-47bb-0310-9956-ffa450edef68

lucene/src/test/org/apache/lucene/index/TestIndexWriterDelete.java

@@ -533,6 +533,12 @@ public class TestIndexWriterDelete extends LuceneTestCase {
           }
         }
 
+        if (!success) {
+          // Must force the close else the writer can have
+          // open files which cause exc in MockRAMDir.close
+          modifier.rollback();
+        }
+
         // If the close() succeeded, make sure there are
         // no unreferenced files.
         if (success) {