checkout: make "opts" in cmd_checkout() a pointer
"opts" will soon be moved out of cmd_checkout(). To keep changes in that patch smaller, convert "opts" to a pointer and keep the real thing behind "real_opts". Signed-off-by: NNguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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