FreeBSD 11 RC1 - no wifi

Hi,

I have upgraded from FreeBSD 10.3 to 11 RC1 on my Lenovo W450 with Intel
Centrino Ultimate-N 6300

After upgrade and a last reboot the iwn driver gets loaded but no iwn0
interface pops up. Doing a 'service netif restart' crashes the machine
and a core is written.

I have attached the output of the dmesg command. If somebody needs the
core, I can upload it somewhere and give you the download link.

Please tell me how I can help you guys.

Cheers,
Stefan