refs.c: remove lock_fd from struct ref_lock
The 'lock_fd' is the same as 'lk->fd'. No need to store it twice so remove it. No functional changes intended. Signed-off-by: NStefan Beller <sbeller@google.com> Reviewed-by: NMichael Haggerty <mhagger@alum.mit.edu> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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