* sys/netinet6/nd6.c: correct sysctl for ndp -p/-r to use proper   copyout() logic.
* sys/netinet6/nd6.c: correct sysctl for ndp -p/-r to use proper
  copyout() logic.

MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame,MarginC/kame