tuntap: Don't segment multiple tagged packets on tap device

Tap devices don't need to segment multiple tagged packets.
Signed-off-by: NToshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/tun.c

@@ -961,6 +961,7 @@ static const struct net_device_ops tap_netdev_ops = {
 #ifdef CONFIG_NET_POLL_CONTROLLER
 	.ndo_poll_controller	= tun_poll_controller,
 #endif
+	.ndo_features_check	= passthru_features_check,
 };
 
 static void tun_flow_init(struct tun_struct *tun)