anchao opened a new pull request, #20862:
URL: https://github.com/apache/nuttx/pull/20862
## Summary
Fix the `MTDIOC_BULKERASE` error check in the rwbuffer MTD wrapper.
`mtd_ioctl()` forwards `MTDIOC_BULKERASE` to the wrapped MTD device and
then invalidates the rwbuffer cache. The previous code checked the result
with `ret >= 0`, which treated a successful erase as an error and skipped
cache invalidation.
This change checks for `ret < 0` instead, so the cache is invalidated
after a successful bulk erase.
## Impact
- Restores cache invalidation after successful `MTDIOC_BULKERASE`.
- Prevents stale rwbuffer cache contents after erasing the underlying
device.
- Keeps the actual device erase call unchanged.
- Only affects the rwbuffer wrapper bulk erase ioctl path.
## Testing
sim/mtdrwb
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