net: hns3: fix access null pointer issue when set tx-buf-size as 0

When set tx-buf-size as 0 by ethtool, hns3_init_tx_spare_buffer()
will return directly and priv->ring->tx_spare->len is uninitialized,
then print function access priv->ring->tx_spare->len will cause
this issue.

When set tx-buf-size as 0 by ethtool, the print function will
print 0 directly and not access priv->ring->tx_spare->len.

Fixes: 2373b35c ("net: hns3: add log for setting tx spare buf size")
Signed-off-by: Hao Chen <chenhao288@hisilicon.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c

@@ -1915,6 +1915,9 @@ static int hns3_set_tunable(struct net_device *netdev,
 			return ret;
 		}
 
+		if (!priv->ring->tx_spare)
+			netdev_info(netdev, "the active tx spare buf size is 0, disable tx spare buffer\n");
+		else
 			netdev_info(netdev, "the active tx spare buf size is %u, due to page order\n",
 				    priv->ring->tx_spare->len);