_GetNextAddOn
static status_t _GetNextAddOn(BDirectory **directory, int32 *index,
static status_t _GetNextAddOn(BDirectory *directory,
error = _GetNextAddOn(fPartitionAddOnDir, &image);
error = _GetNextAddOn(fFSAddOnDir, &image);
error = _GetNextAddOn(*directory, image);
error = _GetNextAddOn(&directory, &index, "partition", image);