message: Add lock checks before trying to spend zerocoin
diff: @@ -7019,6 +7019,14 @@ void AutoSpendZeroCoin()
  continue;
  }
  + TRY_LOCK(cs_main, fLockedMain);
  + if (!fLockedMain)
  + continue;
  +
  + TRY_LOCK(pwallet->cs_wallet, fLockedWallet);
  + if (!fLockedWallet)
  + continue;
  +
  bool fSuccess = pwallet->SpendZerocoin(found * libzerocoin::ZerocoinDenominationToInt(denom_to_spend) * COIN, 1, receipt, vMintsSelected, false, false, denom_to_spend, &destination);
  if (fSuccess) {
  