[PATCH] sparse: if_mii() helper (from jgarzik)

[PATCH] sparse: if_mii() helper (from jgarzik)

From: Jeff Garzik

	Jeff's patch adds a helper for obtaining mii_ioctl_data from ifreq
and switches drivers to it.  It's almost a "move common expression into
inline helper", except that instead of

	(struct mii_ioctl_data *)&rq->ifr_ifru.ifru_data

it does

	(struct mii_ioctl_data *)&rq->ifr_ifru

- pointer to union instead of pointer to a field of union that has nothing
to do with mii_ioctl_data *and* adds confusion by being a pointer itself.