[NET]: Shave sizeof(ptr) bytes off dst_entry

	int			__use;

	struct dst_entry	*child;

	struct net_device       *dev;

	int			obsolete;

	short			error;

	short			obsolete;

	int			flags;

#define DST_HOST		1

#define DST_NOXFRM		2

	unsigned long		rate_last;	/* rate limiting for ICMP */

	unsigned long		rate_tokens;

	int			error;

	struct neighbour	*neighbour;

	struct hh_cache		*hh;

	struct xfrm_state	*xfrm;