files_transaction_cleanup(): new helper function
Extract the cleanup functionality from `files_transaction_commit()` into a new function. It will soon have another caller. Use the common cleanup code even on early exit if the transaction is empty, to reduce code duplication. Signed-off-by: NMichael Haggerty <mhagger@alum.mit.edu> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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