Add strict check to phpass's CheckPassword() method to avoid issues when the method is improperly called.



git-svn-id: http://core.svn.wordpress.org/trunk@24457 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Have wpdb::flush() reset more variables.



git-svn-id: http://core.svn.wordpress.org/trunk@24459 1a063a9b-81f0-0310-95a4-ce76da25c4cd