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In a following commit, we will need to add all the oids from a set into another set. In "list-objects-filter.c", there is already a static function called add_all() to do that. Let's rename this function oidset_insert_from_set() and move it into oidset.{c,h} to make it generally available. While at it, let's remove a useless `!= NULL`. Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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