Panic on start when setting affinity

[Stebalien]

I have a user report about minstant panicing on start when it calls set_affinity:

minstant/src/tsc_now.rs

Line 112 in 27c9ec5

set_affinity(id).unwrap();

I'm still trying to get to the bottom of what's causing this issue, but it would be nice to just return TSCLevel::Unstable on error instead.