i2c: 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: Wolfram Sang <wsa@the-dreams.de>
diff --git a/drivers/i2c/muxes/i2c-mux-pca954x.c b/drivers/i2c/muxes/i2c-mux-pca954x.c
index a531d80..bad5b84 100644
--- a/drivers/i2c/muxes/i2c-mux-pca954x.c
+++ b/drivers/i2c/muxes/i2c-mux-pca954x.c
@@ -185,7 +185,7 @@
 			 const struct i2c_device_id *id)
 {
 	struct i2c_adapter *adap = to_i2c_adapter(client->dev.parent);
-	struct pca954x_platform_data *pdata = client->dev.platform_data;
+	struct pca954x_platform_data *pdata = dev_get_platdata(&client->dev);
 	int num, force, class;
 	struct pca954x *data;
 	int ret = -ENODEV;