fix clippy

src/network.rs

@@ -389,7 +389,7 @@ impl NetworkProcessor {
     ) {
         loop {
             let now = Instant::now();
-            self.process_poll_event(Some(timeout), |e| event_callback(e));
+            self.process_poll_event(Some(timeout), &mut event_callback);
             if now.elapsed() > timeout {
                 break
             }

src/network/poll.rs

@@ -83,7 +83,7 @@ impl Poll {
                     break
                 }
                 Err(ref err) if err.kind() == ErrorKind::Interrupted => continue,
-                Err(ref err) => Err(err).expect("No error here"),
+                Err(ref err) => panic!("{}: No error here", err),
             }
         }
     }