l2tp: use nla_put_u64_64bit()

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/uapi/linux/l2tp.h b/include/uapi/linux/l2tp.h
index 3386a99..4bd27d0 100644
--- a/include/uapi/linux/l2tp.h
+++ b/include/uapi/linux/l2tp.h
@@ -143,6 +143,7 @@
 	L2TP_ATTR_RX_SEQ_DISCARDS,	/* u64 */
 	L2TP_ATTR_RX_OOS_PACKETS,	/* u64 */
 	L2TP_ATTR_RX_ERRORS,		/* u64 */
+	L2TP_ATTR_STATS_PAD,
 	__L2TP_ATTR_STATS_MAX,
 };