btrfs: always choose work from prio_head first
In case we do not refill, we can overwrite cur pointer from prio_head by one from not prioritized head, what looks as something that was not intended. This change make we always take works from prio_head first until it's not empty. Signed-off-by: Stanislaw Gruszka <stf_xl@wp.pl> Signed-off-by: Josef Bacik <jbacik@fb.com>
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