[PATCH] iio:dac:ad3552r: Fix an IS_ERR() vs NULL check

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

The fwnode_get_named_child_node() function does not return error
pointers.  It returns NULL.  Update the check accordingly.

Fixes: 8f2b54824b28 ("drivers:iio:dac: Add AD3552R driver support")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
 drivers/iio/dac/ad3552r.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/dac/ad3552r.c b/drivers/iio/dac/ad3552r.c
index 97f13c0b9631..59f49b7564b2 100644
--- a/drivers/iio/dac/ad3552r.c
+++ b/drivers/iio/dac/ad3552r.c
@@ -809,10 +809,10 @@ static int ad3552r_configure_custom_gain(struct ad3552r_desc *dac,
 
 	gain_child = fwnode_get_named_child_node(child,
 						 "custom-output-range-config");
-	if (IS_ERR(gain_child)) {
+	if (!gain_child) {
 		dev_err(dev,
 			"mandatory custom-output-range-config property missing\n");
-		return PTR_ERR(gain_child);
+		return -EINVAL;
 	}
 
 	dac->ch_data[ch].range_override = 1;
-- 
2.20.1