[NET]: Split skb->csum

... into anonymous union of __wsum and __u32 (csum and csum_offset resp.)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 0ef1848..842abd9 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -1350,7 +1350,7 @@
 		u32 tcpsum;
 
 		tcpsum = offset << 16;		/* sum start */
-		tcpsum |= offset + skb->csum;	/* sum write */
+		tcpsum |= offset + skb->csum_offset;	/* sum write */
 
 		ctrl = CALSUM | WR_SUM | INIT_SUM | LOCK_SUM;
 		if (skb->nh.iph->protocol == IPPROTO_UDP)