qeth: remove unnecessary support ckeck in sysfs route6

Removing this check improves usability because you do not have to
set the device online to initially set ipv6 routing option.

Signed-off-by: Frank Blaschka <[e-mail]>
Signed-off-by: Jeff Garzik <[e-mail]>

drivers/s390/net/qeth_l3_sys.c

···
 	if (!card)
 		return -EINVAL;
 
-	if (!qeth_is_supported(card, IPA_IPV6))
-		return sprintf(buf, "%s\n", "n/a");
-
 	return qeth_l3_dev_route_show(card, &card->options.route6, buf);
 }
 
···
 
 	if (!card)
 		return -EINVAL;
-
-	if (!qeth_is_supported(card, IPA_IPV6)) {
-		return -EOPNOTSUPP;
-	}
 
 	return qeth_l3_dev_route_store(card, &card->options.route6,
 				QETH_PROT_IPV6, buf, count);