`extractFileTail` should open a file in `try` statement

--- a/java/core/src/java/org/apache/orc/impl/ReaderImpl.java
       long maxFileLength) throws IOException {
-    FSDataInputStream file = fs.open(path);
+    FSDataInputStream file = null;
     ByteBuffer buffer;
     OrcProto.PostScript ps;
     OrcProto.FileTail.Builder fileTailBuilder = OrcProto.FileTail.newBuilder();
     long modificationTime;
     try {
+      file = fs.open(path);