fsck_head_link(): remove unneeded flag variable
It is never read, so we can pass NULL to resolve_ref_unsafe(). Signed-off-by: NMichael Haggerty <mhagger@alum.mit.edu> Signed-off-by: NDavid Turner <dturner@twopensource.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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