Bluetooth: mgmt: add mgmt_cmd_status in add_advertising

If an error occurs during request building in add_advertising(),
remember to send MGMT_STATUS_FAILED command status back to bluetoothd.

Signed-off-by: Joseph Hwang <[e-mail]>
Signed-off-by: Manish Mandlik <[e-mail]>
Signed-off-by: Marcel Holtmann <[e-mail]>

net/bluetooth/mgmt.c

···
 	if (!err)
 		err = hci_req_run(&req, add_advertising_complete);
 
-	if (err < 0)
+	if (err < 0) {
+		err = mgmt_cmd_status(sk, hdev->id, MGMT_OP_ADD_ADVERTISING,
+				      MGMT_STATUS_FAILED);
 		mgmt_pending_remove(cmd);
+	}
 
 unlock:
 	hci_dev_unlock(hdev);