message: Use next_byte function in all places in scanf
diff: @@ -71,8 +71,7 @@ unsafe fn inner_scanf<R: Read>(
  }
  while *format != 0 {
  - let mut c = *format as u8;
  - format = format.offset(1);
  + let mut c = next_byte(&mut format)?;
  if c == b' ' {
  maybe_read!(noreset);
  