Use unique_ptr for pwalletMain (CWallet)

src/wallet/test/wallet_test_fixture.cpp

@@ -8,7 +8,7 @@
 #include "wallet/db.h"
 #include "wallet/wallet.h"
 
-CWallet *pwalletMain;
+std::unique_ptr<CWallet> pwalletMain;
 
 WalletTestingSetup::WalletTestingSetup(const std::string& chainName):
     TestingSetup(chainName)
@@ -17,18 +17,17 @@ WalletTestingSetup::WalletTestingSetup(const std::string& chainName):
 
     bool fFirstRun;
     std::unique_ptr<CWalletDBWrapper> dbw(new CWalletDBWrapper(&bitdb, "wallet_test.dat"));
-    pwalletMain = new CWallet(std::move(dbw));
+    pwalletMain = std::unique_ptr<CWallet>(new CWallet(std::move(dbw)));
     pwalletMain->LoadWallet(fFirstRun);
-    RegisterValidationInterface(pwalletMain);
+    RegisterValidationInterface(pwalletMain.get());
 
     RegisterWalletRPCCommands(tableRPC);
 }
 
 WalletTestingSetup::~WalletTestingSetup()
 {
-    UnregisterValidationInterface(pwalletMain);
-    delete pwalletMain;
-    pwalletMain = nullptr;
+    UnregisterValidationInterface(pwalletMain.get());
+    pwalletMain.reset();
 
     bitdb.Flush(true);
     bitdb.Reset();