mfd: dm355evm_msp: Switch to gpiochip_add_data()

We're planning to remove the gpiochip_add() function to swith
to gpiochip_add_data() with NULL for data argument.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
diff --git a/drivers/mfd/dm355evm_msp.c b/drivers/mfd/dm355evm_msp.c
index ec4438e..d7d59f8 100644
--- a/drivers/mfd/dm355evm_msp.c
+++ b/drivers/mfd/dm355evm_msp.c
@@ -260,7 +260,7 @@
 
 	/* GPIO-ish stuff */
 	dm355evm_msp_gpio.parent = &client->dev;
-	status = gpiochip_add(&dm355evm_msp_gpio);
+	status = gpiochip_add_data(&dm355evm_msp_gpio, NULL);
 	if (status < 0)
 		return status;