jbd2: unify revoke and tag block checksum handling
Revoke and tag descriptor blocks are just different kinds of descriptor blocks and thus have checksum in the same place. Unify computation and checking of checksums for these. Reviewed-by: NDarrick J. Wong <darrick.wong@oracle.com> Signed-off-by: NJan Kara <jack@suse.cz> Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
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