net: macb: replace dev_kfree_skb_irq by dev_consume_skb_irq for drop profiles

dev_consume_skb_irq() should be called in at91ether_interrupt() when
skb xmit done. It makes drop profiles(dropwatch, perf) more friendly.
Signed-off-by: Yang Wei <yang.wei9@zte.com.cn>
Reviewed-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/cadence/macb_main.c

@@ -3763,7 +3763,7 @@ static irqreturn_t at91ether_interrupt(int irq, void *dev_id)
 			dev->stats.tx_errors++;
 
 		if (lp->skb) {
-			dev_kfree_skb_irq(lp->skb);
+			dev_consume_skb_irq(lp->skb);
 			lp->skb = NULL;
 			dma_unmap_single(&lp->pdev->dev, lp->skb_physaddr,
 					 lp->skb_length, DMA_TO_DEVICE);