Fix Findbugs warnings

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1446909 13f79535-47bb-0310-9956-ffa450edef68
Fix Findbugs warning

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1446910 13f79535-47bb-0310-9956-ffa450edef68
Suppress false positive

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1446912 13f79535-47bb-0310-9956-ffa450edef68