s390: print correct level for HiperSockets devices

For real HiperSockets the EBCDIC-ASCII conversion is not necessary.
This is only needed for z/VM GuestLAN devices.

Signed-off-by: Ursula Braun <braunu@de.ibm.com>
Signed-off-by: Frank Pavlic <fpavlic@de.ibm.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>