Fix various Eclipse warnings

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1444609 13f79535-47bb-0310-9956-ffa450edef68
Fix copy and paste error highlighted by Eclipse NPE warnings

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1444611 13f79535-47bb-0310-9956-ffa450edef68
s/childs/children/

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1444614 13f79535-47bb-0310-9956-ffa450edef68
Fix typo

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1444615 13f79535-47bb-0310-9956-ffa450edef68