Fix clippy errors

quinn-proto/src/connection.rs

@@ -618,7 +618,6 @@ impl Connection {
                 );
             }
         }
-        mem::drop(space);
 
         // OnPacketsLost
         if let Some(largest_lost) = lost_packets.last().cloned() {

quinn-proto/src/packet.rs

@@ -803,7 +803,7 @@ pub enum SpaceId {
 impl SpaceId {
     pub fn iter() -> impl Iterator<Item = Self> {
         [SpaceId::Initial, SpaceId::Handshake, SpaceId::Data]
-            .into_iter()
+            .iter()
             .cloned()
     }
 }