* ext/psych/psych_emitter.c (allocate): allocate structs with
  making new wrapper objects and get rid of potential memory leak.

* ext/psych/psych_parser.c (allocate): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50672 b2dd03c8-39d4-4d8f-98ff-823fe69b080e