sgi-xp: fix a use after free

Its illegal to dereference skb after dev_kfree_skb(skb)
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Robin Holt <holt@sgi.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/misc/sgi-xp/xpnet.c

@@ -495,14 +495,14 @@ xpnet_dev_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 		}
 	}
 
+	dev->stats.tx_packets++;
+	dev->stats.tx_bytes += skb->len;
+
 	if (atomic_dec_return(&queued_msg->use_count) == 0) {
 		dev_kfree_skb(skb);
 		kfree(queued_msg);
 	}
 
-	dev->stats.tx_packets++;
-	dev->stats.tx_bytes += skb->len;
-
 	return NETDEV_TX_OK;
 }