hwmon: (nct6775) fix coccinelle warnings

drivers/hwmon/nct6775.c:3866:1-3: WARNING: PTR_RET can be used

 Use PTR_ERR_OR_ZERO rather than if(IS_ERR(...)) + PTR_ERR

Generated by: coccinelle/api/ptr_ret.cocci

CC: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: NFengguang Wu <fengguang.wu@intel.com>
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>

drivers/hwmon/nct6775.c

@@ -3862,10 +3862,7 @@ static int nct6775_probe(struct platform_device *pdev)
 
 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, data->name,
 							   data, data->groups);
-	if (IS_ERR(hwmon_dev))
-		return PTR_ERR(hwmon_dev);
-
-	return 0;
+	return PTR_ERR_OR_ZERO(hwmon_dev);
 }
 
 #ifdef CONFIG_PM