Make clippy and fmt happy

milli/src/index.rs

@@ -542,7 +542,7 @@ impl Index {
             main_key::VECTOR_HNSW_KEY_PREFIX.as_bytes(),
         )?;
         let mut deleted = false;
-        while let Some(_) = iter.next().transpose()? {
+        while iter.next().transpose()?.is_some() {
             // We do not keep a reference to the key or the value.
             unsafe { deleted |= iter.del_current()? };
         }

milli/src/readable_slices.rs

@@ -54,9 +54,10 @@ impl<A: AsRef<[u8]>> Read for ReadableSlices<A> {
 
 #[cfg(test)]
 mod test {
-    use super::ReadableSlices;
     use std::io::Read;
 
+    use super::ReadableSlices;
+
     #[test]
     fn basic() {
         let data: Vec<_> = (0..100).collect();