ata: use dev_get_platdata()

Use the wrapper function for retrieving the platform data instead of
accessing dev->platform_data directly.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/drivers/ata/pata_platform.c b/drivers/ata/pata_platform.c
index 71e0937..0279488 100644
--- a/drivers/ata/pata_platform.c
+++ b/drivers/ata/pata_platform.c
@@ -180,7 +180,7 @@
 	struct resource *io_res;
 	struct resource *ctl_res;
 	struct resource *irq_res;
-	struct pata_platform_info *pp_info = pdev->dev.platform_data;
+	struct pata_platform_info *pp_info = dev_get_platdata(&pdev->dev);
 
 	/*
 	 * Simple resource validation ..