tun: Turn tun_flow_init() into void fn
This routine doesn't fail since 9fdc6bef (tuntap: dont use a private kmem_cache) so it makes sense to compact the code a little bit. Signed-off-by: NPavel Emelyanov <xemul@parallels.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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