HDFS-14414. Clean up findbugs warning in branch-2. Contributed by Dinesh Chitlangia.
Signed-off-by: Wei-Chiu Chuang <weichiu@apache.org>
(cherry picked from commit 66ac00312886efe350745b0b5077a4c89b3c78c3)
(cherry picked from commit 64e985f54f7a11d52e3d974e4fedcd43e38d0600)