[IPSEC]: Fix scatterlist handling in skb_icv_walk().

Use sg_init_one() and sg_init_table() as needed.
Signed-off-by: David S. Miller <davem@davemloft.net>

net/xfrm/xfrm_algo.c

@@ -553,7 +553,7 @@ int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *desc,
 		if (copy > len)
 			copy = len;
 
-		sg_set_buf(&sg, skb->data + offset, copy);
+		sg_init_one(&sg, skb->data + offset, copy);
 
 		err = icv_update(desc, &sg, copy);
 		if (unlikely(err))
@@ -576,6 +576,7 @@ int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *desc,
 			if (copy > len)
 				copy = len;
 
+			sg_init_table(&sg, 1);
 			sg_set_page(&sg, frag->page, copy,
 				    frag->page_offset + offset-start);