message: Add missing cs_main lock when checking pindexFnalized
diff: @@ -3925,6 +3925,7 @@ static bool FinalizeBlockInternal(CValidationState &state, CBlockIndex *pindex)
  }
  // Check that the request is consistent with current finalization.
  + LOCK(cs_main); // for pindexFinalized
  if (pindexFinalized && !AreOnTheSameFork(pindex, pindexFinalized))
  {
  return state.DoS(20, error("%s: Trying to finalize block %s which conflicts "
  