vxlan: use reset to set header pointers

Since offset is zero, it's not necessary to use set function. Reset
function is straightforward, and will remove the unnecessary add operation
in set function.
Signed-off-by: NZhang Shengju <zhangshengju@cmss.chinamobile.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/vxlan.c

@@ -1460,7 +1460,7 @@ static struct sk_buff *vxlan_na_create(struct sk_buff *request,
 	reply->dev = dev;
 	skb_reserve(reply, LL_RESERVED_SPACE(request->dev));
 	skb_push(reply, sizeof(struct ethhdr));
-	skb_set_mac_header(reply, 0);
+	skb_reset_mac_header(reply);
 
 	ns = (struct nd_msg *)skb_transport_header(request);
 
@@ -1480,7 +1480,7 @@ static struct sk_buff *vxlan_na_create(struct sk_buff *request,
 	reply->protocol = htons(ETH_P_IPV6);
 
 	skb_pull(reply, sizeof(struct ethhdr));
-	skb_set_network_header(reply, 0);
+	skb_reset_network_header(reply);
 	skb_put(reply, sizeof(struct ipv6hdr));
 
 	/* IPv6 header */
@@ -1495,7 +1495,7 @@ static struct sk_buff *vxlan_na_create(struct sk_buff *request,
 	pip6->saddr = *(struct in6_addr *)n->primary_key;
 
 	skb_pull(reply, sizeof(struct ipv6hdr));
-	skb_set_transport_header(reply, 0);
+	skb_reset_transport_header(reply);
 
 	na = (struct nd_msg *)skb_put(reply, sizeof(*na) + na_olen);