if_em(4) carrier loss event not recognized with i217; while 82574 does recognize

[Harry Schmalzbauer]

 Bezüglich Harry Schmalzbauer's Nachricht vom 10.05.2018 21:17 (localtime):
>  Hello,
>
> if I pull the TP connection from my i217 Clarkville, HEAD still reports
> media
> 1000Base-T status "active".
>
> Doing the same with the other if_em(4) NIC in that box, a hartwell,
> 82574LM, the status correctly changes to "no carrier".
>
> This is not iflib related, since it's reproducable with FreeBSD
> 11-stable (some months old).
>
> Shall I file a PR?

Not reproducable anymore with r333469.

Thanks,

-harry