astobj2: correct define for ao2_t_cleanup

This change maps the ao2_t_cleanup() function to the
correct debug function so that it can be used.

Review: https://reviewboard.asterisk.org/r/3764/



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@418488 65c4cc65-6c06-0410-ace0-fbb531ad65f3