https://github.com/ruby/openssl/commit/e76f076f093efb93dabf2cb042c527500f956061
patches are provided by rhe (Kazuki Yamaguchi).

* ext/openssl/ossl_x509ext.c: additional fix memory leak.
  [ruby-core:76922] [Bug #12680]

* text/openssl/test_x509ext.rb: test for above.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@56032 b2dd03c8-39d4-4d8f-98ff-823fe69b080e