8139too: use netdev_alloc_skb

This patch uses netdev_alloc_skb. This sets skb->dev and allows
arch specific allocation. Also cleanup the alignment code.

Signed-off-by:	Kevin Lo <kevlo@kevlo.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

drivers/net/8139too.c

@@ -2009,9 +2009,9 @@ static int rtl8139_rx(struct net_device *dev, struct rtl8139_private *tp,
 		/* Malloc up new buffer, compatible with net-2e. */
 		/* Omit the four octet CRC from the length. */
 
-		skb = dev_alloc_skb (pkt_size + 2);
+		skb = netdev_alloc_skb(dev, pkt_size + NET_IP_ALIGN);
 		if (likely(skb)) {
-			skb_reserve (skb, 2);	/* 16 byte align the IP fields. */
+			skb_reserve (skb, NET_IP_ALIGN);	/* 16 byte align the IP fields. */
 #if RX_BUF_IDX == 3
 			wrap_copy(skb, rx_ring, ring_offset+4, pkt_size);
 #else