message: Remove let-else, just use ? propagation.
diff: @@ -478,10 +478,9 @@ fn parse_known_hosts_line(line: &str, location: KnownHostLocation) -> Option<Kno
  return None;
  }
  let mut parts = line.split([' ', '\t']).filter(|s| !s.is_empty());
  - let Some(patterns) = parts.next() else { return None };
  - let Some(key_type) = parts.next() else { return None };
  - let Some(key) = parts.next() else { return None };
  - let Ok(key) = base64::decode(key) else { return None };
  + let patterns = parts.next()?;
  + let key_type = parts.next()?;
  + let key = parts.next().map(base64::decode)?.ok()?;
  Some(KnownHost {
  location,
  patterns: patterns.to_string(),
  