strbuf is a bit overkill for this function. What we need is to call
absolute_path() twice and make sure the second call does not destroy the
result of the first. One buffer allocation is enough.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Reviewed-by: Eric Sunshine <sunshine@sunshineco.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>