change a misplaced splnet() in kqueue_poll() to splhigh(). fixes a random panics with kqueue under high load with many events.
change a misplaced splnet() in kqueue_poll() to splhigh(). fixes a
random panics with kqueue under high load with many events.

tested by me
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orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars