tunnels: Remove stat member from ip_tunnel struct.

All users already use on-device statistics, so this field can be
safely removed.

Signed-off-by: Pavel Emelyanov <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/net/ipip.h

···
 {
 	struct ip_tunnel	*next;
 	struct net_device	*dev;
-	struct net_device_stats	stat;
 
 	int			recursion;	/* Depth of hard_start_xmit recursion */
 	int			err_count;	/* Number of arrived ICMP errors */