small cleanup in MessageCryptoHelper

public class MessageCryptoHelper {

    private static final int INVALID_OPENPGP_RESULT_CODE = -1;

    private static final MimeBodyPart NO_REPLACEMENT_PART = null;

    public static final int REQUEST_CODE_USER_INTERACTION = 124;

    public static final int PROGRESS_SIZE_THRESHOLD = 4096;

    private static final int REQUEST_CODE_USER_INTERACTION = 124;

    private static final int PROGRESS_SIZE_THRESHOLD = 4096;

    private final Context context;

    private final String openPgpProviderPackage;

    private final Object callbackLock = new Object();

    private final Deque<CryptoPart> partsToDecryptOrVerify = new ArrayDeque<>();

    @Nullable

    private MessageCryptoCallback callback;

    private MessageCryptoAnnotations messageAnnotations;

    private Deque<CryptoPart> partsToDecryptOrVerify = new ArrayDeque<>();

    private CryptoPart currentCryptoPart;

    private Intent currentCryptoResult;

    private Intent userInteractionResultIntent;

    }

    private void cleanupAfterProcessingFinished() {

        partsToDecryptOrVerify = null;

        partsToDecryptOrVerify.clear();

        openPgpApi = null;

        if (openPgpServiceConnection != null) {

            openPgpServiceConnection.unbindFromService();