don't use locks when reading usecounts (reading only, not writing)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@5994 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/module.h

@@ -210,9 +210,7 @@ void ast_unregister_atexit(void (*func)(void));
 }
 
 #define STANDARD_USECOUNT(res) { \
-	ast_mutex_lock(&localuser_lock); \
 	res = localusecnt; \
-	ast_mutex_unlock(&localuser_lock); \
 }