net: ip6_gre: Remove generic .ndo_get_stats64

Commit 3e2f544d ("net: get stats64 if device if driver is
configured") moved the callback to dev_get_tstats64() to net core, so,
unless the driver is doing some custom stats collection, it does not
need to set .ndo_get_stats64.

Since this driver is now relying in NETDEV_PCPU_STAT_TSTATS, then, it
doesn't need to set the dev_get_tstats64() generic .ndo_get_stats64
function pointer.
Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/ip6_gre.c

@@ -1434,7 +1434,6 @@ static const struct net_device_ops ip6gre_netdev_ops = {
 	.ndo_start_xmit		= ip6gre_tunnel_xmit,
 	.ndo_siocdevprivate	= ip6gre_tunnel_siocdevprivate,
 	.ndo_change_mtu		= ip6_tnl_change_mtu,
-	.ndo_get_stats64	= dev_get_tstats64,
 	.ndo_get_iflink		= ip6_tnl_get_iflink,
 };
 
@@ -1857,7 +1856,6 @@ static const struct net_device_ops ip6gre_tap_netdev_ops = {
 	.ndo_set_mac_address = eth_mac_addr,
 	.ndo_validate_addr = eth_validate_addr,
 	.ndo_change_mtu = ip6_tnl_change_mtu,
-	.ndo_get_stats64 = dev_get_tstats64,
 	.ndo_get_iflink = ip6_tnl_get_iflink,
 };
 
@@ -1920,7 +1918,6 @@ static const struct net_device_ops ip6erspan_netdev_ops = {
 	.ndo_set_mac_address =	eth_mac_addr,
 	.ndo_validate_addr =	eth_validate_addr,
 	.ndo_change_mtu =	ip6_tnl_change_mtu,
-	.ndo_get_stats64 =	dev_get_tstats64,
 	.ndo_get_iflink =	ip6_tnl_get_iflink,
 };