dpaa2-eth: mark unused parameter in dpaa2_eth_tx_conf

The ch parameter is never used in the dpaa2_eth_tx_conf function but
since its prototype must match the type defined in the consume field of
struct dpaa2_eth_fq, just mark it as __always_unused.
Signed-off-by: NIoana Ciornei <ioana.ciornei@nxp.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c

@@ -659,7 +659,7 @@ static netdev_tx_t dpaa2_eth_tx(struct sk_buff *skb, struct net_device *net_dev)
 
 /* Tx confirmation frame processing routine */
 static void dpaa2_eth_tx_conf(struct dpaa2_eth_priv *priv,
-			      struct dpaa2_eth_channel *ch,
+			      struct dpaa2_eth_channel *ch __always_unused,
 			      const struct dpaa2_fd *fd,
 			      struct napi_struct *napi __always_unused,
 			      u16 queue_id __always_unused)