fss: Inappropriate ioctl for device (on dk*)

[Edgar Fuß <ef%math.uni-bonn.de@localhost>]

Now, additionally to fssconfig -c not working at all for me
(it does work without "-c"), it now looks that it doesn't work
on wedges:

fssconfig CALL  open(0x7f7fffffdbb0,2,0)
fssconfig NAMI  "/dev/rfss0"
fssconfig RET   open 3
fssconfig CALL  ioctl(3,FSSIOCSET,0x7f7fffffdbf0)
fssconfig GIO   fd 3 wrote 24 bytes
       "\M^A\M-~\M^?\M^?\^?\^?\0\0\^P\M-W\M^?\M^?\^?\^?\0\0\0\0\0\0\^B\0\0\0"
fssconfig NAMI  "/export/home"
fssconfig NAMI  "/var/db/00008552aa"
fssconfig NAMI  "/dev/dk5"
fssconfig RET   ioctl -1 errno 25 Inappropriate ioctl for device

It does work for a fs on /dev/raid0g:

fssconfig CALL  open(0x7f7fffffdbb0,2,0)
fssconfig NAMI  "/dev/rfss0"
fssconfig RET   open 3
fssconfig CALL  ioctl(3,FSSIOCSET,0x7f7fffffdbf0)
fssconfig GIO   fd 3 wrote 24 bytes
       "\M^I\M-~\M^?\M^?\^?\^?\0\0\^P\M-W\M^?\M^?\^?\^?\0\0\0\0\0\0\^B\0\0\0"
fssconfig NAMI  "/mnt/test"
fssconfig NAMI  "/var/db/00008835aa"
fssconfig NAMI  "/dev/raid0g"
fssconfig NAMI  "/var/db/00008835aa"
fssconfig NAMI  "/var/db/00008835aa"
fssconfig RET   ioctl 0

That's on 6.0_BETA2/amd64.