wallet: Fix -maxtxfee check by moving it to CWallet::CreateTransaction

src/qt/walletmodel.cpp

@@ -221,9 +221,12 @@ WalletModel::SendCoinsReturn WalletModel::prepareTransaction(WalletModelTransact
             return TransactionCreationFailed;
         }
 
-        // Reject absurdly high fee
-        if (nFeeRequired > m_wallet->getDefaultMaxTxFee())
+        // Reject absurdly high fee. (This can never happen because the
+        // wallet never creates transactions with fee greater than
+        // m_default_max_tx_fee. This merely a belt-and-suspenders check).
+        if (nFeeRequired > m_wallet->getDefaultMaxTxFee()) {
             return AbsurdFee;
+        }
     }
 
     return SendCoinsReturn(OK);