astobj2: assert on invalid ref and backtrace cleanup

If a reference count goes negative, instead of
just logging that fact, be more helpful with a
backtrace and an assert that will DO_CRASH.

This patch also removes the duplicate ao2_bt()
function and cleans up extraneous usage of the
ast_log_backtrace() call.

Review: https://reviewboard.asterisk.org/r/3765/



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@418963 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_pjsip_pubsub.c

@@ -992,8 +992,6 @@ int ast_sip_subscription_notify(struct ast_sip_subscription *sub, void *notify_d
 			PJSIP_EVSUB_STATE_ACTIVE : PJSIP_EVSUB_STATE_TERMINATED;
 	}
 
-	ast_log_backtrace();
-
 	if (pjsip_evsub_notify(evsub, state, NULL, NULL, &tdata) != PJ_SUCCESS) {
 		ast_free(body_text);
 		return -1;