drivers/net: starfire: Fix napi ->poll() weight handling

starfire napi ->poll() handler can return work == weight after calling
netif_rx_complete() (if there is no more work). It is illegal and this
patch fixes it.

Reported-by: Alexander Huemer <[e-mail]>
Tested-by: Alexander Huemer <[e-mail]>
Signed-off-by: Jarek Poplawski <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/starfire.c

···
 		desc->status = 0;
 		np->rx_done = (np->rx_done + 1) % DONE_Q_SIZE;
 	}
+
+	if (*quota == 0) {	/* out of rx quota */
+		retcode = 1;
+		goto out;
+	}
 	writew(np->rx_done, np->base + CompletionQConsumerIdx);
 
  out: