message: fix format string to obtain desired output
diff: @@ -6,6 +6,6 @@ fn main() {
  let buf = &[1,2,3,4];
  let n = <BigEndian as ByteOrder>::read_u32(buf);
  assert_eq!(n, 0x01020304);
  - println!("{:#x}", n);
  + println!("{:#010x}", n);
  eprintln!("standard error");
  }
  