Adjust code added in 7463064b280 (object.h: add
lookup_object_by_type() function, 2021-06-22) to use the BUG()
function.
Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>