Re: [PATCH] fsck: use ERROR_MULTI_PACK_INDEX

"Derrick Stolee via GitGitGadget" [off-list ref] writes:

From: Derrick Stolee <redacted>

The multi-pack-index was added to the data verified by git-fsck in
ea5ae6c3 "fsck: verify multi-pack-index".

That's 66ec0390 (fsck: verify multi-pack-index, 2018-09-13) that
first appeared in v2.20

This implementation was
based on the implementation for verifying the commit-graph, and a
copy-paste error kept the ERROR_COMMIT_GRAPH flag as the bit set
when an error appears in the multi-pack-index.

Add a new flag, ERROR_MULTI_PACK_INDEX, and use that instead.

Thanks.  Will queue.