[Wallet] Remove un-necessary CheckTransaction call when loading wallet.

Large wallets suffer from long loading times as it is, this call to
`CheckTransaction()` just adds to that loading time.

Github-Pull: #1222
Rebased-From: 3de6c63

src/wallet/walletdb.cpp

@@ -485,10 +485,7 @@ bool ReadKeyValue(CWallet* pwallet, CDataStream& ssKey, CDataStream& ssValue, CW
             ssKey >> hash;
             CWalletTx wtx;
             ssValue >> wtx;
-            CValidationState state;
-            // fZerocoinActive false because there is no reason to go through the zerocoin checks for our own wallet
-            // fColdStakingActive true to unserialize old P2CS outputs.
-            if (!(CheckTransaction(wtx, false, false, state, false, true) && (wtx.GetHash() == hash) && state.IsValid()))
+            if (wtx.GetHash() != hash)
                 return false;
 
             // Undo serialize changes in 31600
@@ -733,8 +730,8 @@ DBErrors CWalletDB::LoadWallet(CWallet* pwallet)
     bool fNoncriticalErrors = false;
     DBErrors result = DB_LOAD_OK;
 
+    LOCK(pwallet->cs_wallet);
     try {
-        LOCK(pwallet->cs_wallet);
         int nMinVersion = 0;
         if (Read((std::string) "minversion", nMinVersion)) {
             if (nMinVersion > CLIENT_VERSION)