When moving packet header data from mbuf to mbuf, re-init the list

of mbuf tags on the `from' mbuf so that we're not in danger of
double-freeing should the M_PKTHDR flag somehow sneak back to
that mbuf.

I'm almost sure that this is theoretical, but I'm erring on the
side of paranoia.

Found when chasing a panic report from phessler@

ok claudio@ henning@

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