sequencer: make sign_off_header a file local symbol
Commit d0aaa46f ("commit: move empty message checks to libgit", 2017-11-10) removes the last use of 'sign_off_header' outside of the "sequencer.c" source file. Remove the extern declaration from the header file and mark the definition of the symbol with the static keyword. Signed-off-by: NRamsay Jones <ramsay@ramsayjones.plus.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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