Each recursive call was creating an `OsString` for a `&Path`, only for it to be turned into a `CString` right away. Instead we can directly pass `.name_cstr()`, saving two allocations each time.
Each recursive call was creating an `OsString` for a `&Path`, only for it to be turned into a `CString` right away. Instead we can directly pass `.name_cstr()`, saving two allocations each time.