suppress warning
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54217 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
suppress warning
maybe-uninitialized warning by gcc 4.8.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54217 b2dd03c8-39d4-4d8f-98ff-823fe69b080e