xfs: enhance btree key checking

This series addresses some deficiencies in btree key comparisons that I
noticed while testing online scrub.  The first fixes a bug in the rmap
key comparison that prevents the rmap scrubber from detecting rmap
records for file space allocations with mismatched attr/bmbt flags.
The second patch fixes the scrub btree block checker to ensure that the
keys in the parent block accurately represent the block.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
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