If the devicetree node is not referenced in a zone under /thermal-zones,
devm_thermal_of_zone_register will fail with -ENODEV.

Since the driver is now also registering as an IIO device, allow the
probe to continue without the thermal zone.

Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
---
 drivers/thermal/thermal-generic-adc.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/thermal/thermal-generic-adc.c b/drivers/thermal/thermal-generic-adc.c
index 14aef682e0fb..d31533927be6 100644
--- a/drivers/thermal/thermal-generic-adc.c
+++ b/drivers/thermal/thermal-generic-adc.c
@@ -183,14 +183,14 @@ static int gadc_thermal_probe(struct platform_device *pdev)
 						    &gadc_thermal_ops);
 	if (IS_ERR(gti->tz_dev)) {
 		ret = PTR_ERR(gti->tz_dev);
-		if (ret != -EPROBE_DEFER)
-			dev_err(dev,
-				"Thermal zone sensor register failed: %d\n",
-				ret);
-		return ret;
-	}
+		if (ret == -EPROBE_DEFER)
+			return ret;
 
-	devm_thermal_add_hwmon_sysfs(dev, gti->tz_dev);
+		dev_info(dev, "Thermal zone sensor register failed: %d\n",
+			 ret);
+	} else {
+		devm_thermal_add_hwmon_sysfs(dev, gti->tz_dev);
+	}
 
 	indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
 	if (!indio_dev)

-- 
2.51.0