hwmon: (nct6683) Display warning when enabling driver for unknown customer

Enabling the driver for devices with unknown customer ID is at least
somewhat risky, so add a warning to the kernel log.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/nct6683.c

@@ -1236,6 +1236,8 @@ static int nct6683_probe(struct platform_device *pdev)
 	default:
 		if (!force)
 			return -ENODEV;
+		dev_warn(dev, "Enabling support for unknown customer ID 0x%04x\n", data->customer_id);
+		break;
 	}
 
 	nct6683_init_device(data);