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This macro was added in 3443546f6ef (Use a *real* built-in diff generator, 2006-03-24), but none of the xdiff code uses it, it uses xdl_free() directly. If we need its functionality again we'll use the FREE_AND_NULL() macro added in 481df65f4f7 (git-compat-util: add a FREE_AND_NULL() wrapper around free(ptr); ptr = NULL, 2017-06-15). Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>