sentry/control: fix Lifecycle.Shutdown() panics #11773
Merged
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sentry/control: fix Lifecycle.Shutdown() panics
close() on a nil channel panics, so this command panics unconditionally in
runsc (where boot.controller.registerHandlers() passes Lifecycle.ShutdownCh ==
nil). close() on a closed channel also panics, so issuing this command twice
panics unconditionally.