[media] rc-core: fix return codes in ir_lirc_ioctl()

These should be -ENOSYS because not -EINVAL.

Reported-by: Sean Young <sean@mess.org>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>