fix compiler warnings (half)

src/device/sampler.rs

@@ -211,49 +211,3 @@ pub fn handle (state: &mut Sampler, event: &AppEvent) -> Result<(), Box<dyn Erro
     //}
     Ok(())
 }
-
-pub struct SamplerJack;
-
-impl SamplerJack {
-    fn activate <P> (self, client: Client, handler: P) -> Usually<AsyncClient<Self, P>>
-        where P: 'static + Send + ::jack::ProcessHandler
-    {
-        Ok(client.activate_async(self, handler)?)
-    }
-}
-
-impl NotificationHandler for SamplerJack {
-    fn thread_init (&self, _: &Client) {
-    }
-
-    fn shutdown (&mut self, status: ClientStatus, reason: &str) {
-    }
-
-    fn freewheel (&mut self, _: &Client, is_enabled: bool) {
-    }
-
-    fn sample_rate (&mut self, _: &Client, _: Frames) -> Control {
-        Control::Quit
-    }
-
-    fn client_registration (&mut self, _: &Client, name: &str, is_reg: bool) {
-    }
-
-    fn port_registration (&mut self, _: &Client, port_id: PortId, is_reg: bool) {
-    }
-
-    fn port_rename (&mut self, _: &Client, id: PortId, old: &str, new: &str) -> Control {
-        Control::Continue
-    }
-
-    fn ports_connected (&mut self, _: &Client, id_a: PortId, id_b: PortId, are: bool) {
-    }
-
-    fn graph_reorder (&mut self, _: &Client) -> Control {
-        Control::Continue
-    }
-
-    fn xrun (&mut self, _: &Client) -> Control {
-        Control::Continue
-    }
-}