xfs: don't allow sorting sparse arrays

Now that we've reduced the functionality of xfarray_unset, let's add a
new safeguard: no sorting of xfarrays with sparse holes in them.  It's
not clear what that even means, and nobody actually does this, so we're
really just eliminating subtle logic bombs.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

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