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2021-02-04T14:24:35.289582Z
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ipfw(8) crashes when ext6hdr option is omitted

Verify that the option is passed, error out if it's not.
The problem can be trivially triggered with `ipfw add allow ext6hdr`.

PR:		253169
Reviewed by:	kp@
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D28447

(cherry picked from commit 682c31db4ecfb8fc6cac0e8ad4945c03379ea3d1)

Git Hash:   d2eeacf7728a04ee04be8a69b2b1bf375ff24994
Git Author: 2khramtsov@gmail.com
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