message: Fixed problem when client gets stuck on some blocks
diff: @@ -1230,7 +1230,7 @@ bool CheckSpendZcoinTransaction(const CTransaction &tx, CZerocoinEntry pubCoinTx
  walletdb.ListCoinSpendSerial(listCoinSpendSerial);
  BOOST_FOREACH(const CZerocoinSpendEntry &item, listCoinSpendSerial) {
  if (item.coinSerial == serialNumber
  - && (nHeight > ZC_CHECK_BUG_FIXED_AT_BLOCK || item.denomination == targetDenomination)
  + && nHeight > ZC_CHECK_BUG_FIXED_AT_BLOCK
  && (item.id >= 0 && (uint32_t) item.id == pubcoinId)
  && item.hashTx != hashTx) {
  return state.DoS(0, error("CTransaction::CheckTransaction() : The CoinSpend serial has been used"));
  