e179d973 insta-panics in nl_send_one()

From: Poul-Henning Kamp <phk_at_phk.freebsd.dk>
Date: Sat, 06 Jan 2024 22:31:53 UTC 
With fresh current:

	commit e179d9739b1438ae9acb958f80a983eff7e3dce9
	Author: Michael Tuexen <tuexen@FreeBSD.org>
	Date:   Sat Jan 6 21:31:46 2024 +0100

	    tcpsso: support TIME_WAIT state
    
I get an insta-panic as soon as any network interface comes up:

	--- trap 0xc, rip = 0xffff...f80d97b78, rsp = 0x...
	nl_send_one() at nl_send_one+0x18/frame 0xf....
	nl_send_group() at nl_send_group+0x1bc/frame 0xf...
	_nlmsg_flush() at _nlmsg_flush+0x37/frame 0xf...
	rtnl_handle_ifevent() + 0xa1
	if_attach_internal + 0x3df

I have a picture of the full panic if desired...

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.