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We do not report to the caller when rolling back a lockfile fails, which will be needed by the reftable compaction logic in a subsequent commit. It also cannot really report on all errors because the function calls `delete_tempfile()`, which doesn't return an error either. Refactor the code so that both `delete_tempfile()` and `rollback_lock_file()` return an error code. Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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