dir.c: remove the second declaration of "stk" in prep_exclude()
This "stk" shadows the first declaration at the top. There's currently no bad effect. But let's avoid it. Signed-off-by: NNguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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