files-backend: make files_log_ref_write() static
Created in 5f3c3a4e (files_log_ref_write: new function - 2015-11-10) but probably never used outside refs-internal.c Signed-off-by: NNguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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