task: remove a copy operation

src/task.rs

@@ -42,18 +42,18 @@ impl ScheduledTask {
     }
 
     fn start(&mut self) {
-        self.state = match self.state {
-            ScheduledState::Stopped => ScheduledState::Start,
-            ScheduledState::Stop => ScheduledState::Running,
-            _ => self.state
+        match self.state {
+            ScheduledState::Stopped => self.state = ScheduledState::Start,
+            ScheduledState::Stop => self.state = ScheduledState::Running,
+            _ => ()
         }
     }
 
     fn stop(&mut self) {
-        self.state = match self.state {
-            ScheduledState::Running => ScheduledState::Stop,
-            ScheduledState::Start => ScheduledState::Stopped,
-            _ => self.state
+        match self.state {
+            ScheduledState::Running => self.state = ScheduledState::Stop,
+            ScheduledState::Start => self.state = ScheduledState::Stopped,
+            _ => ()
         }
     }