net: ll_temac: Remove unused tx_bd_next struct field

The tx_bd_next field was included in the initial commit,
commit 92744989 ("net: add Xilinx ll_temac device driver"),
but has never had any real use.
Signed-off-by: Esben Haabendal <esben@geanix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/xilinx/ll_temac.h

@@ -372,7 +372,6 @@ struct temac_local {
 	struct cdmac_bd *rx_bd_v;
 	dma_addr_t rx_bd_p;
 	int tx_bd_ci;
-	int tx_bd_next;
 	int tx_bd_tail;
 	int rx_bd_ci;
 	int rx_bd_tail;

drivers/net/ethernet/xilinx/ll_temac_main.c

@@ -387,7 +387,6 @@ static int temac_dma_bd_init(struct net_device *ndev)
 
 	/* Init descriptor indexes */
 	lp->tx_bd_ci = 0;
-	lp->tx_bd_next = 0;
 	lp->tx_bd_tail = 0;
 	lp->rx_bd_ci = 0;
 	lp->rx_bd_tail = RX_BD_NUM - 1;