name-hash.c: always initialize dir_next pointer
Test t2021-checkout-overwrite.sh reveals a segfault in 'git add' on a case-insensitive file system when git is compiled with XMALLOC_POISON defined. The reason is that 2548183b (fix phantom untracked files when core.ignorecase is set) added a new member dir_next to struct cache_entry, but forgot to initialize it in all cases. Signed-off-by: NJohannes Sixt <j6t@kdbg.org> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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