I submitted a pr for this.  Its kern/34737.

http://www.netbsd.org/cgi-bin/query-pr-single.pl?number=34737

Already, a Mr. Woodford sent a patch which I am embarrassed to say I can't 
apply due to my own ignorance of patch construction. I've asked him for 
another patch.  I'll report again when there's more to tell.

David