in mqtt-publish-sample/mqttpublisher-gstreamer-plugin/mqttpublisher/gstmqttpublisher.cc [142:150]
static void gst_mqtt_publisher_finalize(GObject *object) {
GstMqttPublisher *filter = GST_MQTTPUBLISHER(object);
if (filter) {
GST_DEBUG_OBJECT(filter, "finalize");
g_free(filter->publish_topic);
filter->publish_topic = NULL;
}
G_OBJECT_CLASS(parent_class)->finalize(object);
}