[Wallet] Trivial cleanup of HD wallet changes

src/wallet/wallet.cpp

@@ -1200,7 +1200,7 @@ CPubKey CWallet::GenerateNewHDMasterKey()
 
         // write the key&metadata to the database
         if (!AddKeyPubKey(key, pubkey))
-            throw std::runtime_error("CWallet::GenerateNewKey(): AddKey failed");
+            throw std::runtime_error(std::string(__func__)+": AddKeyPubKey failed");
     }
 
     return pubkey;
@@ -3323,7 +3323,6 @@ bool CWallet::InitLoadWallet()
         // Create new keyUser and set as default key
         if (GetBoolArg("-usehd", DEFAULT_USE_HD_WALLET) && walletInstance->hdChain.masterKeyID.IsNull()) {
             // generate a new master key
-            CKey key;
             CPubKey masterPubKey = walletInstance->GenerateNewHDMasterKey();
             if (!walletInstance->SetHDMasterKey(masterPubKey))
                 throw std::runtime_error("CWallet::GenerateNewKey(): Storing master key failed");