fix a typo

* array.c (rb_ary_new_from_values): fix a typo. pointed out by nagachika.
  http://d.hatena.ne.jp/nagachika/20130610/ruby_trunk_changes_41199_41220

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41221 b2dd03c8-39d4-4d8f-98ff-823fe69b080e