[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/include/linux/skbuff.h b/include/linux/skbuff.h
index 874ca02..4175366 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1398,7 +1398,7 @@
 
 extern void __net_timestamp(struct sk_buff *skb);
 
-extern unsigned int __skb_checksum_complete(struct sk_buff *skb);
+extern __sum16 __skb_checksum_complete(struct sk_buff *skb);
 
 /**
  *	skb_checksum_complete - Calculate checksum of an entire packet