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What type of PR is this?
Bug fix
What does this PR do? Why is it needed?
Beaconfuzz discovered an off by one issue where an attestation could be produced which would pass
validation when att.Data.CommitteeIndex is 1 and the committee count per slot is also 1. The only
valid att.Data.Committee index would be 0, so this is an off by one error.
See: sigp/beacon-fuzz#78
Which issues(s) does this PR fix?
Fixes sigp/beacon-fuzz#78
Other notes for review