Git commits in Moodle 2.2.3 by Tony Levi

commit e71b08c529220fe99074742af1446bc37dad41cd
Author: Tony Levi <tony.levi@netspot.com.au>
Date:   Tue, 10 Apr 2012 11:45:39 +0800
Tag:    v2.2.3

MDL-32379: Fix memory leak in session_set_user