kqueue: add some kn_knlist assertions around knlist_(add|remove)HEADmain

We currently assert that kn_status is accurate, but there's more room
for error.  Neither of these are very likely, but currently we'd blow up
in SLIST*() macros instead of providing more obvious diagnostics.  It's
perhaps only worth testing these because knlist_remove() requires
getting logic across both f_attach() and f_detach() correct.

Reviewed by:	kib, markj
Differential Revision:	https://reviews.freebsd.org/D56211

0 files changed, 0 insertions, 0 deletions