platform/x86: dell-ddv: Improve error handling

If for some reason a external function returns -ENODEV,
no error message is being displayed because the driver
assumes that -ENODEV can only be returned internally if
no sensors, etc where found.
Fix this by explicitly returning 0 in such a case since
missing hardware is no error. Also remove the now obsolete
check for -ENODEV.

Signed-off-by: Armin Wolf <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Hans de Goede <[email protected]>
Signed-off-by: Hans de Goede <[email protected]>

Author: Wer-Wolf

drivers/platform/x86/dell/dell-wmi-ddv.c

@@ -616,7 +616,8 @@ static int dell_wmi_ddv_hwmon_add(struct dell_wmi_ddv_data *data)
 	}
 
 	if (index < 2) {
-		ret = -ENODEV;
+		/* Finding no available sensors is not an error */
+		ret = 0;
 
 		goto err_release;
 	}
@@ -841,13 +842,13 @@ static int dell_wmi_ddv_probe(struct wmi_device *wdev, const void *context)
 
 	if (IS_REACHABLE(CONFIG_ACPI_BATTERY)) {
 		ret = dell_wmi_ddv_battery_add(data);
-		if (ret < 0 && ret != -ENODEV)
+		if (ret < 0)
 			dev_warn(&wdev->dev, "Unable to register ACPI battery hook: %d\n", ret);
 	}
 
 	if (IS_REACHABLE(CONFIG_HWMON)) {
 		ret = dell_wmi_ddv_hwmon_add(data);
-		if (ret < 0 && ret != -ENODEV)
+		if (ret < 0)
 			dev_warn(&wdev->dev, "Unable to register hwmon interface: %d\n", ret);
 	}