message: Corrected reader_allsteps.cpp bpReader check
diff: @@ -125,7 +125,7 @@ int main(int argc, char *argv[])
  auto bpReader =
  bpReaderSettings.Open("myNumbers.bp", adios::OpenMode::r);
  - if (bpReader == nullptr)
  + if (!bpReader)
  throw std::ios_base::failure(
  "ERROR: failed to open ADIOS bpReader\n");
  