message: Make sure cs_wallet is locking throughtout LoadWallet()
  Was missing some coverage in walletdb.cpp
diff: @@ -767,9 +767,9 @@ DBErrors CWalletDB::FindWalletTx(CWallet *pwallet, vector<uint256> &vTxHash, vec
  bool fNoncriticalErrors = false;
  DBErrors result = DB_LOAD_OK;
  + LOCK(pwallet->cs_wallet);
  try
  {
  - LOCK(pwallet->cs_wallet);
  int nMinVersion = 0;
  if (Read((string) "minversion", nMinVersion))
  {
  