message: Detect -usehd mismatches when wallet.dat already exists
diff: @@ -3403,6 +3403,16 @@ bool CWallet::InitLoadWallet()
  walletInstance->SetBestChain(chainActive.GetLocator());
  }
  + else if (mapArgs.count("-usehd"))
  + {
  + bool useHD = GetBoolArg("-usehd", DEFAULT_USE_HD_WALLET);
  + if (!walletInstance->hdChain.masterKeyID.IsNull() && !useHD)
  + return InitError(
  + strprintf(_("Error loading %s: You can't disable HD on a already existing HD wallet"), walletFile));
  + if (walletInstance->hdChain.masterKeyID.IsNull() && useHD)
  + return InitError(
  + strprintf(_("Error loading %s: You can't enable HD on a already existing non-HD wallet"), walletFile));
  + }
  LOGA(" wallet %15dms\n", GetTimeMillis() - nStart);
  