dir.c: use the cache_* macro to access the current index
These codepaths always start from the_index and use index_*
functions, but there is no reason to do so. Use the compatibility
cache_* macro to access the current in-core index like everybody
else.
While at it, fix typo in the comment for a function to check if a
path within a directory appears in the index.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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