[affenape]

For something having 2024 in its name I expected a more consistent error handling, but guess what:

* some functions like fsRenderCreate return 0 or 1 depending on the operation result;

* some like fsMapViewCreate say that a value less than 0 is returned on error;

* fsIOOpen says you should also consult with the fsIOGetLastError function on failure.

Hope somebody considers adding the errno.