diff_aligned_abbrev: use "struct oid"
Since we're modifying this function anyway, it's a good time to update it to the more modern "struct oid". We can also drop some of the magic numbers in favor of GIT_SHA1_HEXSZ, along with some descriptive comments. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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