message: Fix uninitialized memory in ffs_marshal.c
diff: @@ -1502,7 +1502,7 @@ extern void SstFFSWriterEndStep(SstStream Stream, size_t Timestep)
  }
  if (Info->AttributeFields)
  {
  - struct FFSFormatBlock *Block = malloc(sizeof(*Block));
  + struct FFSFormatBlock *Block = calloc(1, sizeof(*Block));
  FMFormat Format = FMregister_simple_format(
  Info->LocalFMContext, "Attributes", Info->AttributeFields,
  FMstruct_size_field_list(Info->AttributeFields, sizeof(char *)));
  