core: remove unused error from TxPool.Pending (#23720)

eth/api_backend.go

@@ -240,10 +240,7 @@ func (b *EthAPIBackend) SendTx(ctx context.Context, signedTx *types.Transaction)
 }
 
 func (b *EthAPIBackend) GetPoolTransactions() (types.Transactions, error) {
-	pending, err := b.eth.txPool.Pending(false)
-	if err != nil {
-		return nil, err
-	}
+	pending := b.eth.txPool.Pending(false)
 	var txs types.Transactions
 	for _, batch := range pending {
 		txs = append(txs, batch...)

eth/catalyst/api.go

@@ -126,10 +126,7 @@ func (api *consensusAPI) AssembleBlock(params assembleBlockParams) (*executableD
 		time.Sleep(wait)
 	}
 
-	pending, err := pool.Pending(true)
-	if err != nil {
-		return nil, err
-	}
+	pending := pool.Pending(true)
 
 	coinbase, err := api.eth.Etherbase()
 	if err != nil {

eth/handler.go

@@ -66,7 +66,7 @@ type txPool interface {
 
 	// Pending should return pending transactions.
 	// The slice should be modifiable by the caller.
-	Pending(enforceTips bool) (map[common.Address]types.Transactions, error)
+	Pending(enforceTips bool) map[common.Address]types.Transactions
 
 	// SubscribeNewTxsEvent should return an event subscription of
 	// NewTxsEvent and send events to the given channel.

eth/handler_test.go

@@ -91,7 +91,7 @@ func (p *testTxPool) AddRemotes(txs []*types.Transaction) []error {
 }
 
 // Pending returns all the transactions known to the pool
-func (p *testTxPool) Pending(enforceTips bool) (map[common.Address]types.Transactions, error) {
+func (p *testTxPool) Pending(enforceTips bool) map[common.Address]types.Transactions {
 	p.lock.RLock()
 	defer p.lock.RUnlock()
 
@@ -103,7 +103,7 @@ func (p *testTxPool) Pending(enforceTips bool) (map[common.Address]types.Transac
 	for _, batch := range batches {
 		sort.Sort(types.TxByNonce(batch))
 	}
-	return batches, nil
+	return batches
 }
 
 // SubscribeNewTxsEvent should return an event subscription of NewTxsEvent and

eth/sync.go

@@ -43,7 +43,7 @@ func (h *handler) syncTransactions(p *eth.Peer) {
 	//
 	// TODO(karalabe): Figure out if we could get away with random order somehow
 	var txs types.Transactions
-	pending, _ := h.txpool.Pending(false)
+	pending := h.txpool.Pending(false)
 	for _, batch := range pending {
 		txs = append(txs, batch...)
 	}