Fix findbugs warnings in Hadoop Auth (Alfredo)
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Key: HADOOP-7576
URL: https://issues.apache.org/jira/browse/HADOOP-7576
Project: Hadoop Common
Issue Type: Bug
Components: security
Reporter: Tom White
Found in HADOOP-7567:
https://builds.apache.org/job/PreCommit-HADOOP-Build/65//artifact/trunk/patchprocess/newPatchFindbugsWarningshadoop-alfredo.html
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