hwmon: (asus_atk0110) Do not fail if MBIF is missing

MBIF (motherboard identification) is only used to print the name of
the board, it's not essential for the driver; do not fail if it's
missing. Based on Juan's patch.

Signed-off-by: Luca Tettamanti <kronos.it@gmail.com>
Acked-by: Juan RP <xtraeme@gmail.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
diff --git a/drivers/hwmon/asus_atk0110.c b/drivers/hwmon/asus_atk0110.c
index 6811346..028284f 100644
--- a/drivers/hwmon/asus_atk0110.c
+++ b/drivers/hwmon/asus_atk0110.c
@@ -1329,18 +1329,17 @@
 			&buf, ACPI_TYPE_PACKAGE);
 	if (ret != AE_OK) {
 		dev_dbg(&device->dev, "atk: method MBIF not found\n");
-		err = -ENODEV;
-		goto out;
+	} else {
+		obj = buf.pointer;
+		if (obj->package.count >= 2) {
+			union acpi_object *id = &obj->package.elements[1];
+			if (id->type == ACPI_TYPE_STRING)
+				dev_dbg(&device->dev, "board ID = %s\n",
+					id->string.pointer);
+		}
+		ACPI_FREE(buf.pointer);
 	}
 
-	obj = buf.pointer;
-	if (obj->package.count >= 2 &&
-			obj->package.elements[1].type == ACPI_TYPE_STRING) {
-		dev_dbg(&device->dev, "board ID = %s\n",
-				obj->package.elements[1].string.pointer);
-	}
-	ACPI_FREE(buf.pointer);
-
 	err = atk_probe_if(data);
 	if (err) {
 		dev_err(&device->dev, "No usable hwmon interface detected\n");