Ruby

• st.c (st_foreach_check, st_foreach): remove ancient check. This
  check are from initial ordered hash commit when first entry were
  created with entry->fore = entry->back = entry.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35189 b2dd03c8-39d4-4d8f-98ff-823fe69b080e