HADOOP-11448. Fix findbugs warnings in FileBasedIPList. (ozawa)

(cherry picked from commit 399d25884a99f3e0b2ef65eaf9f3149d0d523f13)

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -305,6 +305,8 @@ Release 2.7.0 - UNRELEASED
     HADOOP-11283. SequenceFile.Writer can leak file descriptors in
     DistCpV1#setup(). (Varun Saxena via ozawa)
 
+    HADOOP-11448. Fix findbugs warnings in FileBasedIPList. (ozawa)
+
 Release 2.6.0 - 2014-11-18
 
   INCOMPATIBLE CHANGES

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/FileBasedIPList.java

@@ -50,7 +50,7 @@ public class FileBasedIPList implements IPList {
 
   public FileBasedIPList(String fileName) {
     this.fileName = fileName;
-    String[] lines = new String[0];
+    String[] lines;
     try {
       lines = readLines(fileName);
     } catch (IOException e) {