[NET]: Annotate __skb_checksum_complete() and friends.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/netfilter.c b/net/ipv6/netfilter.c
index 8d1b542..f6294e5 100644
--- a/net/ipv6/netfilter.c
+++ b/net/ipv6/netfilter.c
@@ -80,11 +80,11 @@
 	return 0;
 }
 
-unsigned int nf_ip6_checksum(struct sk_buff *skb, unsigned int hook,
+__sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook,
 			     unsigned int dataoff, u_int8_t protocol)
 {
 	struct ipv6hdr *ip6h = skb->nh.ipv6h;
-	unsigned int csum = 0;
+	__sum16 csum = 0;
 
 	switch (skb->ip_summed) {
 	case CHECKSUM_COMPLETE: