• MMDB_get_entry_data_list() now always sets the passed entry_data_list
  parameter to either NULL or valid memory. This makes it safe for
  callers to use MMDB_free_entry_data_list() on it even in case of error.
  In 1.12.0 MMDB_get_entry_data_list() was changed to not set this
  parameter to valid memory in additional error cases. That change caused
  segfaults for certain libraries that assumed it was safe to free memory
  on error. Doing so was never safe, but worked in some cases. This change
  makes such calls safe. Reported by Petr Pisar. GitHub
  maxmind/MaxMind-DB-Reader-XS#39.