Btrfs: cleanup dead code of defragment
@is_extent is no more needed since we don't defrag extent root. Signed-off-by: NLiu Bo <bo.li.liu@oracle.com> Signed-off-by: NJosef Bacik <jbacik@fusionio.com> Signed-off-by: NChris Mason <chris.mason@fusionio.com>
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