res_pjsip: Ignore 401/407 responses for transactions and dialogs we don't know about.

Under normal conditions it is unlikely we will ever receive a response for a transaction
or dialog we don't know about but if any are received ignore them.
........

Merged revisions 404371 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@404372 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_pjsip/pjsip_outbound_auth.c

@@ -54,9 +54,11 @@ static pj_bool_t outbound_auth(pjsip_rx_data *rdata)
 
 	tsx = pjsip_rdata_get_tsx(rdata);
 	dlg = pjsip_rdata_get_dlg(rdata);
-	ast_assert(dlg != NULL && tsx != NULL);
-	endpoint = ast_sip_dialog_get_endpoint(dlg);
+	if (!dlg || !tsx) {
+		return PJ_FALSE;
+	}
 
+	endpoint = ast_sip_dialog_get_endpoint(dlg);
 	if (!endpoint) {
 		return PJ_FALSE;
 	}