SendMoney: use already-calculated balance

src/wallet/rpcwallet.cpp

@@ -362,7 +362,7 @@ static void SendMoney(const CTxDestination &address, CAmount nValue, bool fSubtr
     CRecipient recipient = {scriptPubKey, nValue, fSubtractFeeFromAmount};
     vecSend.push_back(recipient);
     if (!pwalletMain->CreateTransaction(vecSend, wtxNew, reservekey, nFeeRequired, nChangePosRet, strError)) {
-        if (!fSubtractFeeFromAmount && nValue + nFeeRequired > pwalletMain->GetBalance())
+        if (!fSubtractFeeFromAmount && nValue + nFeeRequired > curBalance)
             strError = strprintf("Error: This transaction requires a transaction fee of at least %s", FormatMoney(nFeeRequired));
         throw JSONRPCError(RPC_WALLET_ERROR, strError);
     }