tuntap: correctly set SOCKWQ_ASYNC_NOSPACE

[Kamal Mostafa]

This commit requires a light backport, which I will submit to our bionic
patch pipeline.  Thanks for the recommendation, Nicolas!

 -Kamal

On Tue, Aug 13, 2019 at 10:42:44AM +0200, Nicolas Dichtel wrote:
> Hi Ubuntu kernel team,
> 
> please, can you consider to cherry-pick the following linux upstream fix:
> 2f3ab6221e4c ("tuntap: correctly set SOCKWQ_ASYNC_NOSPACE").
> It has been included in v4.17 and the patch that introduces the bug has been
> included in v4.5.
> 
> Here is the launchpad entry:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1830756
> 
> 
> Thank you,
> Nicolas
> 
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