get_expanded_map(): avoid memory leak
The old code could leak *expn_name if match_name_with_pattern() succeeded but ignore_symref_update() returned true. So make sure that *expn_name is freed in any case. Signed-off-by: NMichael Haggerty <mhagger@alum.mit.edu> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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