r8169: Drop tp arg from rtl8169_tx_vlan_tag()

Since eab6d18d (vlan: Don't check for vlan group before
vlan_tx_tag_present.) we don't check tp->vlgrp and thus
tp is not needed in this function.
Signed-off-by: Kirill Smelkov <kirr@mns.spb.ru>
Acked-by: Francois Romieu <romieu@fr.zoreil.com>

drivers/net/ethernet/realtek/r8169.c

@@ -1814,8 +1814,7 @@ static int rtl8169_set_features(struct net_device *dev,
 }
 
 
-static inline u32 rtl8169_tx_vlan_tag(struct rtl8169_private *tp,
-				      struct sk_buff *skb)
+static inline u32 rtl8169_tx_vlan_tag(struct sk_buff *skb)
 {
 	return (vlan_tx_tag_present(skb)) ?
 		TxVlanTag | swab16(vlan_tx_tag_get(skb)) : 0x00;
@@ -5816,7 +5815,7 @@ static netdev_tx_t rtl8169_start_xmit(struct sk_buff *skb,
 	tp->tx_skb[entry].len = len;
 	txd->addr = cpu_to_le64(mapping);
 
-	opts[1] = cpu_to_le32(rtl8169_tx_vlan_tag(tp, skb));
+	opts[1] = cpu_to_le32(rtl8169_tx_vlan_tag(skb));
 	opts[0] = DescOwn;
 
 	rtl8169_tso_csum(tp, skb, opts);