xfs: check the reference counts of gaps in the refcount btree

Gaps in the reference count btree are also significant -- for these
regions, there must not be any overlapping reverse mappings.  We don't
currently check this, so make the refcount scrubber more complete.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

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