attr: fix leak in free_attr_elem
This function frees the individual "struct match_attr"s we have allocated, but forgot to free the array holding their pointers, leading to a minor memory leak (but it can add up after checking attributes for paths in many directories). Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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