npf in -current amd64 (7 Mar 2018) now cannot use a "ruleset" multiple times

[Geoff Wing <gcw%pobox.com@localhost>]

Hi,
npf previously had no issues using a "ruleset" in multiple groups, however
it now has a problem and fails with

	npfctl: (re)load failed: some table has a duplicate entry?

The following is a minimal npf.conf to illustrate with it failing due to
the second ``ruleset "blacklistd"'' causing the issue:
-----
	$if1_if = inet4(vmx0)
	$if2_if = inet4(vmx1)

	alg "icmp"

	group "foo" on $if1_if {
		ruleset "blacklistd"
	}
	group "bar" on $if2_if {
		ruleset "blacklistd"
	}

	group default {
		pass final on lo0 all
		block all
	}
-----

I haven't investigated further yet.  Ring any bells with anyone?

System is amd64 -current.

Regards,
Geoff