dir.c: clean the entire struct in clear_exclude_list()
Make sure "el" can be reuseable again. The problem was el->alloc is not cleared and may cause segfaults next time because add_exclude() thinks el->excludes (being NULL) has enough space. Just clear the entire struct to be safe. Signed-off-by: NNguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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