libertas: make some functions void
They don't return anything meaningfull and no-one cares about their results. Signed-off-by: NHolger Schurig <hs4233@mail.mn-solutions.de> Acked-by: NDan Williams <dcbw@redhat.com> Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
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