Btrfs: don't bother kicking async if there's nothing to reclaim
We do this check when we start the async reclaimer thread, might as well check before we kick it off to save us some cycles. Thanks, Signed-off-by: NJosef Bacik <jbacik@fb.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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