anchao opened a new pull request, #20854: URL: https://github.com/apache/nuttx/pull/20854
## Summary
Fix a lock leak in `tmpfs_statfs()` when filesystem traversal fails.
`tmpfs_statfs()` locks the tmpfs instance before walking the filesystem
with `tmpfs_foreach()` to accumulate usage statistics. If `tmpfs_foreach()`
returns an error, the previous error path returned immediately without
releasing the tmpfs lock.
This change unlocks the filesystem before returning the failure.
## Impact
Without this fix, a failed `statfs()` traversal can leave the tmpfs lock
held permanently. Later tmpfs operations may then block or deadlock when
trying to acquire the same lock.
The success path is unchanged.
## Testing
sim/nsh
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