viotape: use noop_llseek

Some applications try to seek on tape devices
and fail if they return an error. Since we
want to change the default llseek action to
no_llseek, viotape needs to be changed to use
noop_llseek explicitly.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

diff --cc drivers/char/viotape.c
Simple merge