net/sched: cls_flower: Correct matching on ICMPv6 code

When matching on the ICMPv6 code ICMPV6_CODE rather than
ICMPV4_CODE attributes should be used.

This corrects what appears to be a typo.

Sample usage:

tc qdisc add dev eth0 ingress
tc filter add dev eth0 protocol ipv6 parent ffff: flower \
	indev eth0 ip_proto icmpv6 type 128 code 0 action drop

Without this change the code parameter above is effectively ignored.

Fixes: 7b684884fbfa ("net/sched: cls_flower: Support matching on ICMP type and code")
Signed-off-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Red Hat
 * W: http://www.redhat.com/

Deutsche Flugsicherung GmbH
 * W: https://secais.dfs.de/

ETH Zurich:
 * W: http://csg.ethz.ch/

Max Planck Institute for Human Cognitive and Brain Sciences
 * W: http://www.cbs.mpg.de/