Bluetooth: mgmt: Fix return value for set_class

The return parameters for Set Device Class should consist of the new
class value.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 6850a8b..23421f0 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -1470,7 +1470,7 @@
 
 	if (err == 0)
 		err = cmd_complete(sk, index, MGMT_OP_SET_DEV_CLASS, 0,
-								NULL, 0);
+							hdev->dev_class, 3);
 
 unlock:
 	hci_dev_unlock(hdev);