r8169: handle tx before rx in napi poll

Cleaning up tx descriptors first increases the chance that
rtl_rx() can allocate new skb's from the cache.
Signed-off-by: NHeiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/realtek/r8169_main.c

@@ -4587,10 +4587,10 @@ static int rtl8169_poll(struct napi_struct *napi, int budget)
 	struct net_device *dev = tp->dev;
 	int work_done;
 
-	work_done = rtl_rx(dev, tp, budget);
-
 	rtl_tx(dev, tp, budget);
 
+	work_done = rtl_rx(dev, tp, budget);
+
 	if (work_done < budget && napi_complete_done(napi, work_done))
 		rtl_irq_enable(tp);