Shut down is broken

[kvark]

Everything after the event loop is unreachable:

warning: unreachable statement
    --> src/main.rs:1410:9
     |
1096 | /         events_loop.run(move |event, _, control_flow| {
1097 | |             *control_flow = ControlFlow::Poll;
1098 | |
1099 | |             match event {
...    |
1407 | |             }
1408 | |         });
     | |__________- any code following this expression is unreachable
1409 | 
1410 |           device.wait_idle()?;
     |           ^^^^^^^^^^^^^^^^^^^^ unreachable statement