Remove manual assignment of m_pkthdr from one mbuf to another in ipsec_copypkt(), as this is already handled by the call to M_MOVE_PKTHDR(), which also knows how to correctly handle MAC m_tags.  This corrects a panic when running with MAC and KAME IPSEC.
Remove manual assignment of m_pkthdr from one mbuf to another in
ipsec_copypkt(), as this is already handled by the call to M_MOVE_PKTHDR(),
which also knows how to correctly handle MAC m_tags.  This corrects a panic
when running with MAC and KAME IPSEC.

PR:		kern/94599
Submitted by:	zhouyi zhou <zhouyi04 at ios dot cn>
Reviewed by:	bz
MFC after:	3 days

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