Clippy bump (#2877)

* Bumping clippy

* Fixing warnings

* Fix the "fix"

util/src/trie/journal.rs

@@ -84,7 +84,7 @@ impl Journal {
 	pub fn apply(self, db: &mut HashDB) -> Score {
 		trace!("applying {:?} changes", self.0.len());
 		let mut ret = Score{inserts: 0, removes: 0};
-		for d in self.0.into_iter() {
+		for d in self.0 {
 			match d {
 				Operation::Delete(h) => {
 					trace!("TrieDBMut::apply --- {:?}", &h);

util/src/trie/triedb.rs

@@ -87,7 +87,7 @@ impl<'db> TrieDB<'db> {
 	/// Convert a vector of hashes to a hashmap of hash to occurrences.
 	pub fn to_map(hashes: Vec<H256>) -> HashMap<H256, u32> {
 		let mut r: HashMap<H256, u32> = HashMap::new();
-		for h in hashes.into_iter() {
+		for h in hashes {
 			*r.entry(h).or_insert(0) += 1;
 		}
 		r
@@ -97,7 +97,7 @@ impl<'db> TrieDB<'db> {
 	/// trie.
 	pub fn db_items_remaining(&self) -> super::Result<HashMap<H256, i32>> {
 		let mut ret = self.db.keys();
-		for (k, v) in Self::to_map(try!(self.keys())).into_iter() {
+		for (k, v) in Self::to_map(try!(self.keys())) {
 			let keycount = *ret.get(&k).unwrap_or(&0);
 			match keycount <= v as i32 {
 				true => ret.remove(&k),