hwmon: (asb100) Fix vrm write operation

vrm is an u8, so the written value needs to be limited to [0, 255].

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
diff --git a/drivers/hwmon/asb100.c b/drivers/hwmon/asb100.c
index f960636..272fcc8 100644
--- a/drivers/hwmon/asb100.c
+++ b/drivers/hwmon/asb100.c
@@ -510,6 +510,10 @@
 	err = kstrtoul(buf, 10, &val);
 	if (err)
 		return err;
+
+	if (val > 255)
+		return -EINVAL;
+
 	data->vrm = val;
 	return count;
 }