fix warning: unused variable 'X' [-Wunused-variable]

Remove several unused variables.

Signed-off-by: Giel van Schijndel <me@mortis.eu>

src/db.cpp

@@ -627,8 +627,6 @@ int64 CWalletDB::GetAccountCreditDebit(const string& strAccount)
 
 void CWalletDB::ListAccountCreditDebit(const string& strAccount, list<CAccountingEntry>& entries)
 {
-    int64 nCreditDebit = 0;
-
     bool fAllAccounts = (strAccount == "*");
 
     Dbc* pcursor = GetCursor();

src/net.cpp

@@ -1700,7 +1700,7 @@ void StartNode(void* parg)
         printf("Error: CreateThread(ThreadIRCSeed) failed\n");
 
     // Send and receive from sockets, accept connections
-    pthread_t hThreadSocketHandler = CreateThread(ThreadSocketHandler, NULL, true);
+    CreateThread(ThreadSocketHandler, NULL, true);
 
     // Initiate outbound connections
     if (!CreateThread(ThreadOpenConnections, NULL))

src/rpc.cpp

@@ -2419,7 +2419,6 @@ int CommandLineRPC(int argc, char *argv[])
         // Parse reply
         const Value& result = find_value(reply, "result");
         const Value& error  = find_value(reply, "error");
-        const Value& id     = find_value(reply, "id");
 
         if (error.type() != null_type)
         {

src/wallet.cpp

@@ -722,8 +722,6 @@ void CWallet::ResendWalletTransactions()
 
 int64 CWallet::GetBalance() const
 {
-    int64 nStart = GetTimeMillis();
-
     int64 nTotal = 0;
     CRITICAL_BLOCK(cs_mapWallet)
     {
@@ -736,7 +734,6 @@ int64 CWallet::GetBalance() const
         }
     }
 
-    //printf("GetBalance() %"PRI64d"ms\n", GetTimeMillis() - nStart);
     return nTotal;
 }