Fix some clippy warnings

blockchain/src/history/history_store.rs

@@ -1272,17 +1272,8 @@ impl HistoryInterface for HistoryStore {
 
         let mut cursor = txn.cursor(&self.last_leaf_table);
 
-        let first = if let Some((key, _)) = cursor.first::<u32, u32>() {
-            key
-        } else {
-            0
-        };
-
-        let last = if let Some((key, _)) = cursor.last::<u32, u32>() {
-            key
-        } else {
-            0
-        };
+        let first = cursor.first::<u32, u32>().unwrap_or_default().0;
+        let last = cursor.last::<u32, u32>().unwrap_or_default().0;
 
         (first, last)
     }

blockchain/src/history/validity_store.rs

@@ -61,23 +61,15 @@ impl ValidityStore {
         // Initialize the cursor for the database.
         let mut cursor = db_tx.cursor(&self.block_txns);
 
-        if let Some((key, _)) = cursor.first::<u32, Blake2bHash>() {
-            key
-        } else {
-            0
-        }
+        cursor.first::<u32, Blake2bHash>().unwrap_or_default().0
     }
 
     /// Obtains the last block number stored in the validity store.
     pub(crate) fn last_bn(&self, db_tx: &TransactionProxy) -> u32 {
         // Initialize the cursor for the database.
         let mut cursor = db_tx.cursor(&self.block_txns);
 
-        if let Some((key, _)) = cursor.last::<u32, Blake2bHash>() {
-            key
-        } else {
-            0
-        }
+        cursor.last::<u32, Blake2bHash>().unwrap_or_default().0
     }
 
     /// Adds a transaction hash to the validity store

consensus/src/sync/light/sync.rs

@@ -62,8 +62,6 @@ pub struct ValidityChunkRequest {
     pub root_hash: Blake2bHash,
     /// The chunk index that was requested.
     pub chunk_index: u32,
-    /// Validity start block number that we are syncing with this peer
-    pub validity_start: u32,
     /// Flag to indicate if there is an election block within the validity window
     pub election_in_window: bool,
     /// Number of items in the previous requested chunk (for cases where we adopt a new macro head)

consensus/src/sync/light/validity_window.rs

@@ -114,7 +114,6 @@ impl<TNetwork: Network> LightMacroSync<TNetwork> {
                 verifier_block_number,
                 root_hash,
                 chunk_index,
-                validity_start: validity_window_start,
                 election_in_window,
                 last_chunk_items,
             });