exfat_get_next_cluster
if (exfat_get_next_cluster(sb, &clu.dir))
if (exfat_get_next_cluster(sb, &(clu.dir)))
int err = exfat_get_next_cluster(sb, &n_clu);
if (exfat_get_next_cluster(sb, &(clu.dir)))
if (exfat_get_next_cluster(sb, &clu.dir))