Vladimír Čunát authored Aug 22, 2020 and Petr Špaček committed Sep 10, 2020

- The malloc-free pair could be avoided without difficulty,
  but it seemed like premature optimization.
- The libknot functions make error handling a bit difficult
  (zero is theoretically valid and doesn't show error type),
  but writing this properly without libknot would need 10-20
  additional lines of code and the risk of encountering errors
  in this function seems very low anyway.