rem: printf("mkdir of %s returned: %s (%d)\n", name, strerror(err), err);
add: printf("mkdir of %s returned: %s (%d)\n", name, fs_strerror(err), err);
context: do_mkdir(int argc, char **argv){    int err;    char name[64];    if (argc < 2)         make_random_name(name, sizeof(name));    else        sprintf(name, "/myfs/%s", &argv[1][0]);    err = sys_mkdir(1, -1, name, MY_S_IRWXU);    if (err)        printf("mkdir of %s returned: %s (%d)\n", name, strerror(err), err);	return err;}