message: Use any instead of position and is_none
  Fixes clippy::search-is-some
diff: @@ -399,7 +399,7 @@ impl<'a> VirtioNetDriver<'a> {
  let mut buffers = &mut self.tx_buffers;
  // do we have free buffers?
  - if buffers.iter().position(|b| !b.in_use).is_none() {
  + if !buffers.iter().any(|b| !b.in_use) {
  // if not, check if we are able to free used elements
  self.check_used_elements();
  }
  