hpet: remove redundant pointer hpet

Pointer hpet is being assigned but is never used hence it is redundant
and can be removed.

Cleans up clang warning:
warning: variable 'hpet' set but not used [-Wunused-but-set-variable]

Signed-off-by: Colin Ian King <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/char/hpet.c

···
 		  struct hpet_info *info)
 {
 	struct hpet_timer __iomem *timer;
-	struct hpet __iomem *hpet;
 	struct hpets *hpetp;
 	int err;
 	unsigned long v;
···
 	case HPET_DPI:
 	case HPET_IRQFREQ:
 		timer = devp->hd_timer;
-		hpet = devp->hd_hpet;
 		hpetp = devp->hd_hpets;
 		break;
 	case HPET_IE_ON: