* regparse.c (parse_char_class): initialize return values before
  depth limit check.  returned values will be freed in callers
  regardless the error.  [ruby-core:79624] [Bug #13234]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57660 b2dd03c8-39d4-4d8f-98ff-823fe69b080e