[PATCH] Fix new-ui tty stream leak

[Simon Marchi]

On 2019-07-18 2:41 p.m., Pedro Alves wrote:
> I noticed that we never close the stream opened by new-ui.
> 
> This fixes it, by adding a new struct ui ctor that takes ownership of
> the passed-in stream.

Hi Pedro,

If I am not mistaken, we never delete the UIs themselves either, so it won't
make a difference today, is that right?  They just live until the end of the
GDB process.

Still, I think this patch is fine, in that it makes things right in case we
decide to make it possible to close an existing UI some day.

Simon