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When xchk_da_btree_block is loading a non-root dabtree block, we know that the parent block had to have a (hashval, address) pointer to the block that we just loaded. Check that the hashval in the parent matches the block we just loaded. This was found by fuzzing nbtree[3].hashval = ones in xfs/394. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com>