When reusing an mbuf at the upper end of the network stack, strip

off the mbuf properties with m_resethdr().  It is a new packet,
especially M_LOOP indicating that it was running through lo(4)
should be cleared.  Use the ph_loopcnt to prevent looping at the
upper end of the stack.  Although not strictly necessary in icmp
reflect, it is a good idea to increase and check the counter here,
like in socket splicing.
OK mpi@ sashan@

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