fix ruby/test_hash.rb [ruby-core:59154] [Bug #9223]

the behavior is under 2.2.0


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@44466 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
fix previous commit


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@44467 b2dd03c8-39d4-4d8f-98ff-823fe69b080e