[media] media: i2c/adp1653: fix check of devm_gpiod_get() error code

The devm_gpiod_get() function returns either a valid pointer to
struct gpio_desc or ERR_PTR() error value, check for NULL is bogus.
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/i2c/adp1653.c

@@ -466,9 +466,9 @@ static int adp1653_of_init(struct i2c_client *client,
 	of_node_put(child);
 
 	pd->enable_gpio = devm_gpiod_get(&client->dev, "enable", GPIOD_OUT_LOW);
-	if (!pd->enable_gpio) {
+	if (IS_ERR(pd->enable_gpio)) {
 		dev_err(&client->dev, "Error getting GPIO\n");
-		return -EINVAL;
+		return PTR_ERR(pd->enable_gpio);
 	}
 
 	return 0;