amd8111e: Don't receive packets when the napi budget == 0

Processing any incoming packets with a with a napi budget of 0
is incorrect driver behavior.

This matters as netpoll will shortly call drivers with a budget of 0
to avoid receive packet processing happening in hard irq context.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/amd/amd8111e.c

@@ -720,6 +720,9 @@ static int amd8111e_rx_poll(struct napi_struct *napi, int budget)
 	int rx_pkt_limit = budget;
 	unsigned long flags;
 
+	if (rx_pkt_limit <= 0)
+		goto rx_not_empty;
+
 	do{
 		/* process receive packets until we use the quota*/
 		/* If we own the next entry, it's a new packet. Send it up. */