I don't even bother with `error1`, `error2`, ... `errorN`. I initialise all pointers to NULL at the top of the function and use `goto cleanup`, which cleans up

I don't even bother with `error1`, `error2`, ... `errorN`. I initialise all pointers to NULL at the top of the function and use `goto cleanup`, which cleans up everything that is not being returned ... because `free(some_ptr)` where `some_ptr` is NULL is perfectly legal.