fix from David Daney, on busybox mailing list:
> The problem is that if the zcip protocol times out at about the same
> time another ARP packet is being received, the newly calculated timeout
> may be set to wait forever. This prevents the protocol from progressing
> through its various states.
>
> The Fix is to set the timeout to zero if it used to be a positive
> number, but it has already expired. This causes the next protocol state
> to be entered immediately instead of never.
>
> If OK please commit.
>
> Also note that if you may have to apply the patch on this page:
>
> http://www.science.uva.nl/research/air/wiki/LinkLocalARPMeasurements
>
> To the linux kernel to get proper zcip behavior.
>
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