xfs: make the record pointer passed to query_range functions const

xfs: make the record pointer passed to query_range functions const

Source kernel commit: 159eb69dba8baf6d5b58b69936920fb311324c82

The query_range functions are supposed to call a caller-supplied
function on each record found in the dataset.  These functions don't
own the memory storing the record, so don't let them change the record.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>