test_stasis.c: Misc cleanups.
* Make the consumer ao2 object use the ao2 lock instead of a redundant
lock in the struct for ast_cond_wait().
* Fixed some curly brace placements.
* Fixed use of malloc(0). malloc(0) has variant behavior. It is up to
the implementation to determine if it returns NULL or a valid pointer that
can be later passed to free().
........
Merged revisions 408983 from http://svn.asterisk.org/svn/asterisk/branches/12
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@408984
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