Do not store curcpu() in syscall and trap handlers since we can go to sleep and wake up on another CPU.
Do not store curcpu() in syscall and trap handlers since we can go to
sleep and wake up on another CPU.

ok kettenis@

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars