wallet: Fix memory leak when loading a corrupted wallet file

src/wallet/wallet.cpp

@@ -3937,15 +3937,12 @@ CWallet* CWallet::CreateWalletFromFile(const std::string walletFile)
         uiInterface.InitMessage(_("Zapping all transactions from wallet..."));
 
         std::unique_ptr<CWalletDBWrapper> dbw(new CWalletDBWrapper(&bitdb, walletFile));
-        CWallet *tempWallet = new CWallet(std::move(dbw));
+        std::unique_ptr<CWallet> tempWallet(new CWallet(std::move(dbw)));
         DBErrors nZapWalletRet = tempWallet->ZapWalletTx(vWtx);
         if (nZapWalletRet != DB_LOAD_OK) {
             InitError(strprintf(_("Error loading %s: Wallet corrupted"), walletFile));
             return nullptr;
         }
-
-        delete tempWallet;
-        tempWallet = nullptr;
     }
 
     uiInterface.InitMessage(_("Loading wallet..."));