net: wan: z85230: replace dev_kfree_skb_irq by dev_consume_skb_irq for drop profiles

dev_consume_skb_irq() should be called in z8530_tx_done() when skb
xmit done. It makes drop profiles(dropwatch, perf) more friendly.
Signed-off-by: Yang Wei <yang.wei9@zte.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/wan/z85230.c

@@ -1536,7 +1536,7 @@ static void z8530_tx_done(struct z8530_channel *c)
 	z8530_tx_begin(c);
 	c->netdevice->stats.tx_packets++;
 	c->netdevice->stats.tx_bytes += skb->len;
-	dev_kfree_skb_irq(skb);
+	dev_consume_skb_irq(skb);
 }
 
 /**