FOP-2193: fix checkstyle and findbugs warnings

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@1435269 13f79535-47bb-0310-9956-ffa450edef68
FOP-2192: fix checkstyle and findbugs warnings

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@1435270 13f79535-47bb-0310-9956-ffa450edef68