m_can_class_unregister
EXPORT_SYMBOL_GPL(m_can_class_unregister);
void m_can_class_unregister(struct m_can_classdev *cdev);
m_can_class_unregister(mcan_class);
m_can_class_unregister(mcan_class);
m_can_class_unregister(&priv->cdev);