securerandom.rb: remove to_s call
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53999 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
securerandom.rb: remove to_s call
no to_s is needed.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53999 b2dd03c8-39d4-4d8f-98ff-823fe69b080e