use ipsec_getnhist() instead of obsoleted ipsec_gethist().
use ipsec_getnhist() instead of obsoleted ipsec_gethist().

Submitted by:	"Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net>
Reviewed by:	Ari Suutari <ari@suutari.iki.fi> (ipfw@)

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