extcon: ptn5150: Fix return value check in ptn5150_i2c_probe()

In case of error, the function devm_gpiod_get() returns ERR_PTR() and
never returns NULL. The NULL test in the return value check should be
replaced with IS_ERR().

Signed-off-by: Wei Yongjun <[e-mail]>
Signed-off-by: Chanwoo Choi <[e-mail]>

drivers/extcon/extcon-ptn5150.c

···
 	info->dev = &i2c->dev;
 	info->i2c = i2c;
 	info->int_gpiod = devm_gpiod_get(&i2c->dev, "int", GPIOD_IN);
-	if (!info->int_gpiod) {
+	if (IS_ERR(info->int_gpiod)) {
 		dev_err(dev, "failed to get INT GPIO\n");
-		return -EINVAL;
+		return PTR_ERR(info->int_gpiod);
 	}
 	info->vbus_gpiod = devm_gpiod_get(&i2c->dev, "vbus", GPIOD_IN);
-	if (!info->vbus_gpiod) {
+	if (IS_ERR(info->vbus_gpiod)) {
 		dev_err(dev, "failed to get VBUS GPIO\n");
-		return -EINVAL;
+		return PTR_ERR(info->vbus_gpiod);
 	}
 	ret = gpiod_direction_output(info->vbus_gpiod, 0);
 	if (ret) {