net: validate_xmit_vlan() is static

Marking this as static allows compiler to inline it.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/core/dev.c

@@ -2645,7 +2645,8 @@ struct sk_buff *dev_hard_start_xmit(struct sk_buff *first, struct net_device *de
 	return skb;
 }
 
-struct sk_buff *validate_xmit_vlan(struct sk_buff *skb, netdev_features_t features)
+static struct sk_buff *validate_xmit_vlan(struct sk_buff *skb,
+					  netdev_features_t features)
 {
 	if (vlan_tx_tag_present(skb) &&
 	    !vlan_hw_offload_capable(features, skb->vlan_proto)) {