Crash when filtering routes in BGP protocol

[Vincent Bernat]

 ❦  8 juillet 2019 13:09 +02, Maria Jan Matejka <jan.matejka at nic.cz>:

>> I have tried to fix that by initializing `old_attrs` to NULL, but this
>> leads to crash elsewhere. Since I don't know what a temporary attribute
>> is, I may miss the whole picture.
>
> I think the old_attrs should be initialized to NULL and the other crash may be independent on this.
> Anyway, I didn't manage to reproduce the other crash; could you please
> try with current master?

With master, I don't have an issue anymore. Thanks!
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