Prepare for latest clippy (nightly 09-10-2022) (#12466)

substrate/primitives/state-machine/src/in_memory_backend.rs

@@ -157,8 +157,8 @@ where
 	fn from((inners, state_version): (Storage, StateVersion)) -> Self {
 		let mut inner: HashMap<Option<ChildInfo>, BTreeMap<StorageKey, StorageValue>> = inners
 			.children_default
-			.into_iter()
-			.map(|(_k, c)| (Some(c.child_info), c.data))
+			.into_values()
+			.map(|c| (Some(c.child_info), c.data))
 			.collect();
 		inner.insert(None, inners.top);
 		(inner, state_version).into()

substrate/primitives/state-machine/src/overlayed_changes/mod.rs

@@ -474,7 +474,7 @@ impl OverlayedChanges {
 	pub fn children(
 		&self,
 	) -> impl Iterator<Item = (impl Iterator<Item = (&StorageKey, &OverlayedValue)>, &ChildInfo)> {
-		self.children.iter().map(|(_, v)| (v.0.changes(), &v.1))
+		self.children.values().map(|v| (v.0.changes(), &v.1))
 	}
 
 	/// Get an iterator over all top changes as been by the current transaction.