fix off-by-one in r58806
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58807 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
fix off-by-one in r58806
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58807 b2dd03c8-39d4-4d8f-98ff-823fe69b080e