[PATCH] mfd: axp20x: Use #ifdef for checking CONFIG_ACPI

[Krzysztof Kozlowski]

Use #ifdef directive to check whether config symbol is defined and to
fix warning:

    drivers/mfd/axp20x-i2c.c:82:5: warning: "CONFIG_ACPI" is not defined [-Wundef]

Signed-off-by: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
---
 drivers/mfd/axp20x-i2c.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mfd/axp20x-i2c.c b/drivers/mfd/axp20x-i2c.c
index bd271fbe1ec1..3c930316d48b 100644
--- a/drivers/mfd/axp20x-i2c.c
+++ b/drivers/mfd/axp20x-i2c.c
@@ -79,7 +79,7 @@ static const struct i2c_device_id axp20x_i2c_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, axp20x_i2c_id);
 
-#if CONFIG_ACPI
+#ifdef CONFIG_ACPI
 static const struct acpi_device_id axp20x_i2c_acpi_match[] = {
 	{
 		.id = "INT33F4",
-- 
2.17.1