aoe: error printed 1 too early

with while (i-- > 0); i reaches -1 after the loop, so the test below is printed
one too early: 0 still means success.
Signed-off-by: NRoel Kluin <roel.kluin@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/block/aoe/aoedev.c

@@ -173,7 +173,7 @@ skbfree(struct sk_buff *skb)
 		return;
 	while (atomic_read(&skb_shinfo(skb)->dataref) != 1 && i-- > 0)
 		msleep(Sms);
-	if (i <= 0) {
+	if (i < 0) {
 		printk(KERN_ERR
 			"aoe: %s holds ref: %s\n",
 			skb->dev ? skb->dev->name : "netif",