I'm running a netbsd-8 userland with the latest nyftp current kernel on amd64 and just saw this on boot:
iwn0: starting wpa_supplicant
iwn0: failed to start wpa_supplicant
iwn0: Sucessfully initialized wpa_supplicant
ioctl[SIOCS80211, op=16, arg_len=0]: Inappropriate ioctl for device
iwn0: Failed to initialize driver interface
wifi appears to work fine... just an FYI in case its relevant to anyone...
Thanks
David