fixed led5 release build

V1/led5/src/main.rs

@@ -81,9 +81,7 @@ fn main() {
     chan_select! {
         rpanic.recv() => { },
         signal.recv() -> signal => {
-            #[cfg(debug_assertions)]
             println!("received signal: {:?}", signal);
-
             sdone.send(());
         }
     }