Merge bitcoin#11007: wallet: Fix potential memory leak when loading a corrupted wallet file

c06755f wallet: Fix memory leak when loading a corrupted wallet file (practicalswift)

Pull request description:

  Fix potential memory leak when loading a corrupted wallet file.

Tree-SHA512: 4b836e4ee1fe4267213bb126af0c1174f964ff015fbe28d0a7e679eab877c275769906b3c08f885763958f6a9b559e1b5e6c7bff1df340bf2dfa2acd57500818

Author: laanwj

src/wallet/wallet.cpp

@@ -5099,15 +5099,12 @@ 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..."));