message: fix assert syntax
diff: @@ -869,7 +869,7 @@ void ParaViewDataCollection::Save()
  {
  if(regex_search(line,match,regexp))
  {
  - MFEM_ASSERT(match.size == 2,
  + MFEM_ASSERT(match.size() == 2,
  "Unable to ascertain time value from existing pvd file: " << pvdname);
  double tvalue = std::stod(match[1]);
  if (tvalue < GetTime())
  