remove a bul entry when we receive ICMPv6 paramprob in RRDEL state.
remove a bul entry when we receive ICMPv6 paramprob in RRDEL state.

Reported by Nicolas Dichtel@6wind

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