static netdev_tx_t hwsim_mon_xmit(struct sk_buff *skb,
					struct net_device *dev)
{
	/* TODO: allow packet injection */
	dev_kfree_skb(skb);
	return NETDEV_TX_OK;
}

The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed.