Close the tun fd when closing the device

[Georg Faerber]

On 17-11-10 12:38:41, Georg Faerber wrote:
> On 17-11-10 22:00:32, Aurélien Chabot wrote:
> > This patch was part of the android development, as this is not
> > specific to android, here is an independent patch. 
> 
> You forgot to attach the patch.. :)

Sorry for the noise! :x
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