Correct test_cel cleanup.

When I corrected the CEL test crash in r394037, I didn't quite pay attention
to how the globals and locals were being shuffled around in the cleanup
callback. I removed the nulling of the global variables, which caused them
to be double cleaned.

This patch puts the global nulling code back (since the vars are cleaned up
by RAII_VARs), and removes the explicit ao2_cleanup() (since they were no-ops,
because the variables had just been nulled).



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@394089 65c4cc65-6c06-0410-ace0-fbb531ad65f3