Default to bnb_used = false as there are many cases where BnB is not used

src/wallet/wallet.cpp

@@ -2270,12 +2270,12 @@ bool CWallet::SelectCoins(const std::vector<COutput>& vAvailableCoins, const CAm
     std::vector<COutput> vCoins(vAvailableCoins);
     CAmount value_to_select = nTargetValue;
 
+    // Default to bnb was not used. If we use it, we set it later
+    bnb_used = false;
+
     // coin control -> return all selected outputs (we want all selected to go into the transaction for sure)
     if (coin_control.HasSelected() && !coin_control.fAllowOtherInputs)
     {
-        // We didn't use BnB here, so set it to false.
-        bnb_used = false;
-
         for (const COutput& out : vCoins)
         {
             if (!out.fSpendable)
@@ -2300,14 +2300,12 @@ bool CWallet::SelectCoins(const std::vector<COutput>& vAvailableCoins, const CAm
             const CWalletTx& wtx = it->second;
             // Clearly invalid input, fail
             if (wtx.tx->vout.size() <= outpoint.n) {
-                bnb_used = false;
                 return false;
             }
             // Just to calculate the marginal byte size
             CInputCoin coin(wtx.tx, outpoint.n, wtx.GetSpendSize(outpoint.n, false));
             nValueFromPresetInputs += coin.txout.nValue;
             if (coin.m_input_bytes <= 0) {
-                bnb_used = false;
                 return false; // Not solvable, can't estimate size for fee
             }
             coin.effective_value = coin.txout.nValue - coin_selection_params.effective_fee.GetFee(coin.m_input_bytes);
@@ -2318,7 +2316,6 @@ bool CWallet::SelectCoins(const std::vector<COutput>& vAvailableCoins, const CAm
             }
             setPresetCoins.insert(coin);
         } else {
-            bnb_used = false;
             return false; // TODO: Allow non-wallet inputs
         }
     }
@@ -2678,7 +2675,7 @@ bool CWallet::CreateTransaction(interfaces::Chain::Lock& locked_chain, const std
                 }
 
                 // Choose coins to use
-                bool bnb_used;
+                bool bnb_used = false;
                 if (pick_new_inputs) {
                     nValueIn = 0;
                     setCoins.clear();