dialog: if sending BYE fails at timeout, unref dialog

- destroy dialog structures

modules/dialog/dlg_handlers.c

@@ -1356,7 +1356,8 @@ void dlg_ontimeout(struct dlg_tl *tl)
 
 		if(dlg->iflags&DLG_IFLAG_TIMEOUTBYE)
 		{
-			dlg_bye_all(dlg, NULL);
+			if(dlg_bye_all(dlg, NULL)<0)
+				dlg_unref(dlg, 1);
 			/* run event route for end of dlg */
 			dlg_run_event_route(dlg, NULL, dlg->state, DLG_STATE_DELETED);
 			dlg_unref(dlg, 1);