pata_platform: Fix NULL pointer dereference

pata_platform: Fix NULL pointer dereference

pata_platform currently dereferences a NULL pointer in pata_platform_probe()
if pdev->dev.platform_data is set to NULL. This breakage was most likely
introduced by commit 5f45bc50.
Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/ata/pata_platform.c

@@ -213,8 +213,9 @@ static int __devinit pata_platform_probe(struct platform_device *pdev)
 	pata_platform_setup_port(&ap->ioaddr, pp_info);
 
 	/* activate */
-	return ata_host_activate(host, platform_get_irq(pdev, 0), ata_interrupt,
-				 pp_info->irq_flags, &pata_platform_sht);
+	return ata_host_activate(host, platform_get_irq(pdev, 0),
+				 ata_interrupt, pp_info ? pp_info->irq_flags
+				 : 0, &pata_platform_sht);
 }
 
 /**