23d1b05726
kmc-solid: Handle errors returned by `SOLID_FS_ReadDir` Fixes the issue where the `std::fs::ReadDir` implementaton of the [`*-kmc-solid_*`](https://doc.rust-lang.org/nightly/rustc/platform-support/kmc-solid.html) Tier 3 targets silently suppressed errors returned by the underlying `SOLID_FS_ReadDir` system function. The new implementation correctly handles all cases: - `SOLID_ERR_NOTFOUND` indicates the end of directory stream. - `SOLID_ERR_OK` + non-empty `d_name` indicates success. - Some old filesystem drivers may return `SOLID_ERR_OK` + empty `d_name` to indicate the end of directory stream. - Any other negative values (per ITRON convention) represent an error.