Bluetooth: btmtksdio: clean up inconsistent error message in btmtksdio_mtk_reg_read

Have "..reg (%d)" to be consistent with the other similar error messages.
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

drivers/bluetooth/btmtksdio.c

@@ -816,7 +816,7 @@ static int btmtksdio_mtk_reg_read(struct hci_dev *hdev, u32 reg, u32 *val)
 
 	err = mtk_hci_wmt_sync(hdev, &wmt_params);
 	if (err < 0) {
-		bt_dev_err(hdev, "Failed to read reg(%d)", err);
+		bt_dev_err(hdev, "Failed to read reg (%d)", err);
 		return err;
 	}