it821x: convert to use ->host_priv

While at it:

* Allocate both struct it821x_dev instances at once.

* Don't leak itdevs on ide_pci_init_one() failure.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/pci/it821x.c

@@ -534,8 +534,9 @@ static struct ide_dma_ops it821x_pass_through_dma_ops = {
 static void __devinit init_hwif_it821x(ide_hwif_t *hwif)
 {
 	struct pci_dev *dev = to_pci_dev(hwif->dev);
-	struct it821x_dev **itdevs = (struct it821x_dev **)pci_get_drvdata(dev);
-	struct it821x_dev *idev = itdevs[hwif->channel];
+	struct ide_host *host = pci_get_drvdata(dev);
+	struct it821x_dev *itdevs = host->host_priv;
+	struct it821x_dev *idev = itdevs + hwif->channel;
 	u8 conf;
 
 	ide_set_hwifdata(hwif, idev);
@@ -648,23 +649,20 @@ static const struct ide_port_info it821x_chipsets[] __devinitdata = {
 
 static int __devinit it821x_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 {
-	struct it821x_dev *itdevs[2] = { NULL, NULL} , *itdev;
-	unsigned int i;
+	struct it821x_dev *itdevs;
+	int rc;
 
-	for (i = 0; i < 2; i++) {
-		itdev = kzalloc(sizeof(*itdev), GFP_KERNEL);
-		if (itdev == NULL) {
-			kfree(itdevs[0]);
+	itdevs = kzalloc(2 * sizeof(*itdevs), GFP_KERNEL);
+	if (itdevs == NULL) {
 		printk(KERN_ERR "it821x: out of memory\n");
 		return -ENOMEM;
 	}
 
-		itdevs[i] = itdev;
-	}
-
-	pci_set_drvdata(dev, itdevs);
+	rc = ide_pci_init_one(dev, &it821x_chipsets[id->driver_data], itdevs);
+	if (rc)
+		kfree(itdevs);
 
-	return ide_pci_init_one(dev, &it821x_chipsets[id->driver_data], NULL);
+	return rc;
 }
 
 static const struct pci_device_id it821x_pci_tbl[] = {