Fix more Clippy warnings.

examples/console_test.rs

@@ -23,8 +23,8 @@ fn main() {
     let mut buf = [0; BUFFER_SIZE];
     loop {
         for i in 1..buf.len() {
-            for j in 0..i {
-                buf[j] = b'0' + ((i % 10) as u8);
+            for byte in buf.iter_mut().take(i) {
+                *byte = b'0' + ((i % 10) as u8);
             }
             buf[i] = b'\n';
             Console::write_unbuffered(&mut buf[..(i + 1)]);

examples/crypto_bench.rs

@@ -151,7 +151,7 @@ fn main() {
 
 fn bench<F>(console: &mut Console, timer: &Timer, title: &str, mut f: F)
 where
-    F: FnMut() -> (),
+    F: FnMut(),
 {
     writeln!(console, "****************************************").unwrap();
     writeln!(console, "Benchmarking: {}", title).unwrap();