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

sys/netinet6/ipsec.c

@@ -3469,15 +3469,6 @@ ipsec_copypkt(m)
 					MGETHDR(mnew, M_DONTWAIT, MT_HEADER);
 					if (mnew == NULL)
 						goto fail;
-					mnew->m_pkthdr = n->m_pkthdr;
-#if 0
-					/* XXX: convert to m_tag or delete? */
-					if (n->m_pkthdr.aux) {
-						mnew->m_pkthdr.aux =
-						    m_copym(n->m_pkthdr.aux,
-						    0, M_COPYALL, M_DONTWAIT);
-					}
-#endif
 					M_MOVE_PKTHDR(mnew, n);
 				}
 				else {