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_at91.c b/drivers/ata/pata_at91.c
index 5364f97..d63ee8f 100644
--- a/drivers/ata/pata_at91.c
+++ b/drivers/ata/pata_at91.c
@@ -315,7 +315,7 @@
 
 static int pata_at91_probe(struct platform_device *pdev)
 {
-	struct at91_cf_data *board = pdev->dev.platform_data;
+	struct at91_cf_data *board = dev_get_platdata(&pdev->dev);
 	struct device *dev = &pdev->dev;
 	struct at91_ide_info *info;
 	struct resource *mem_res;