Crash when filtering routes in BGP protocol

[Vincent Bernat]

 ❦ 25 juin 2019 19:57 +02, Vincent Bernat <bernat at luffy.cx>:

> When filtering routes in BGP, I get the following crash with BIRD
> master:

Bissected to:

ommit 875cc073b067f295cccc668008e10218f8e98dd3
Author: Ondrej Zajicek (work) <santiago at crfreenet.org>
Date:   Thu Mar 14 17:22:22 2019 +0100

    Nest: Update handling of temporary attributes
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