multi: Use const instead of var when possible.

cmd/v3tool/dcrwallet.go

@@ -76,7 +76,7 @@ func (w *dcrwallet) createFeeTx(feeAddress string, fee int64) (string, error) {
 	}
 
 	var locked bool
-	unlock := false
+	const unlock = false
 	err = w.Call(context.TODO(), "lockunspent", &locked, unlock, transactions)
 	if err != nil {
 		return "", err
@@ -118,7 +118,7 @@ func (w *dcrwallet) dumpPrivKey(addr stdaddr.Address) (string, error) {
 
 func (w *dcrwallet) getTickets() (*wallettypes.GetTicketsResult, error) {
 	var tickets wallettypes.GetTicketsResult
-	includeImmature := true
+	const includeImmature = true
 	err := w.Call(context.TODO(), "gettickets", &tickets, includeImmature)
 	if err != nil {
 		return nil, err

cmd/vspd/main.go

@@ -76,7 +76,7 @@ func run() int {
 		return 1
 	}
 
-	writeBackup := true
+	const writeBackup = true
 	defer db.Close(writeBackup)
 
 	// Create a context that is cancelled when a shutdown request is received

rpc/dcrd.go

@@ -168,7 +168,7 @@ func (c *DcrdRPC) DecodeRawTransaction(txHex string) (*dcrdtypes.TxRawDecodeResu
 // SendRawTransaction uses sendrawtransaction RPC to broadcast a transaction to
 // the network. It ignores errors caused by duplicate transactions.
 func (c *DcrdRPC) SendRawTransaction(txHex string) error {
-	allowHighFees := false
+	const allowHighFees = false
 	err := c.Call(c.ctx, "sendrawtransaction", nil, txHex, allowHighFees)
 	if err != nil {
 
@@ -238,7 +238,7 @@ func (c *DcrdRPC) GetBestBlockHeader() (*dcrdtypes.GetBlockHeaderVerboseResult,
 // GetBlockHeaderVerbose uses getblockheader RPC with verbose=true to retrieve
 // the header of the requested block.
 func (c *DcrdRPC) GetBlockHeaderVerbose(blockHash string) (*dcrdtypes.GetBlockHeaderVerboseResult, error) {
-	verbose := true
+	const verbose = true
 	var blockHeader dcrdtypes.GetBlockHeaderVerboseResult
 	err := c.Call(c.ctx, "getblockheader", &blockHeader, blockHash, verbose)
 	if err != nil {

rpc/dcrwallet.go

@@ -170,9 +170,9 @@ func (c *WalletRPC) WalletInfo() (*wallettypes.WalletInfoResult, error) {
 // AddTicketForVoting uses importprivkey RPC, followed by addtransaction RPC, to
 // add a new ticket to a voting wallet.
 func (c *WalletRPC) AddTicketForVoting(votingWIF, blockHash, txHex string) error {
-	label := "imported"
+	const label = "imported"
-	rescan := false
+	const rescan = false
-	scanFrom := 0
+	const scanFrom = 0
 	err := c.Call(c.ctx, "importprivkey", nil, votingWIF, label, rescan, scanFrom)
 	if err != nil {
 		return fmt.Errorf("importprivkey failed: %w", err)