Fix a typo in the non-DEBUG_THREADS version of the recently added DEADLOCK_AVOIDANCE()

macro.  This caused the lock to not actually be released, and as a result, not
avoid deadlocks at all.  This resolves the issues reported in the last while about
Asterisk locking up all over the place (and most commonly, in chan_iax2).

(closes issue #12927)
(closes issue #12940)
(closes issue #12925)
(potentially closes others ...)


git-svn-id: https://origsvn.digium.com/svn/asterisk/tags/1.4.21.1@126578 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/lock.h

@@ -712,9 +712,9 @@ static inline int __ast_cond_timedwait(const char *filename, int lineno, const c
 #else /* !DEBUG_THREADS */
 
 #define	DEADLOCK_AVOIDANCE(lock) \
-	ast_mutex_lock(lock); \
+	ast_mutex_unlock(lock); \
 	usleep(1); \
-	ast_mutex_unlock(lock);
+	ast_mutex_lock(lock);
 
 
 typedef pthread_mutex_t ast_mutex_t;