* variable.c (classname): the name of class that has
  non class id should not be nil. This bug was introduced
  in r36577.

* test/thread/test_cv.rb: test for change.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42867 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* doc/security.rdoc: [DOC] fix typo.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42868 b2dd03c8-39d4-4d8f-98ff-823fe69b080e