ide: remove needless zeroing of hwgroup fields from init_irq()

Since kmalloc_node() is called with __GFP_ZERO flag there is no need to
explicitly zero hwgroup fields.

While at it:

* Use 'hwif' instead of 'hwif->drives[0].hwif' for kmalloc_node() call.

* Fix whitespace damage.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide-probe.c

@@ -998,19 +998,14 @@ static int init_irq (ide_hwif_t *hwif)
 		hwgroup->hwif->next = hwif;
 		spin_unlock_irq(&ide_lock);
 	} else {
-		hwgroup = kmalloc_node(sizeof(ide_hwgroup_t),
-					GFP_KERNEL | __GFP_ZERO,
-					hwif_to_node(hwif->drives[0].hwif));
-		if (!hwgroup)
+		hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
+				       hwif_to_node(hwif));
+		if (hwgroup == NULL)
 			goto out_up;
 
 		hwif->hwgroup = hwgroup;
-
 		hwgroup->hwif = hwif->next = hwif;
-		hwgroup->rq       = NULL;
-		hwgroup->handler  = NULL;
-		hwgroup->drive    = NULL;
-		hwgroup->busy     = 0;
+
 		init_timer(&hwgroup->timer);
 		hwgroup->timer.function = &ide_timer_expiry;
 		hwgroup->timer.data = (unsigned long) hwgroup;