Make private field final since it is not reassigned

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/io/trunk@1347052 13f79535-47bb-0310-9956-ffa450edef68

Author: sebbASF

src/main/java/org/apache/commons/io/input/Tailer.java

@@ -115,7 +115,7 @@ public class Tailer implements Runnable {
     /**
      * Buffer on top of RandomAccessFile.
      */
-    private byte inbuf[];
+    private final byte inbuf[];
 
     /**
      * The file which will be tailed.