drbd: don't pretend that barrier_nr == 0 was special
We used to have a barrier implementation where barrier_nr 0 was reserved. That is long gone. Just use the full sequence space. Signed-off-by: NPhilipp Reisner <philipp.reisner@linbit.com> Signed-off-by: NLars Ellenberg <lars.ellenberg@linbit.com>
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