cmd/utils: use IsHexAddress method (ethereum#32997)

Using the `IsHexAddress` method will result in no gaps in the
verification logic, making it simpler.

Author: mask-pp

cmd/utils/flags.go

@@ -20,7 +20,6 @@ package utils
 import (
 	"context"
 	"crypto/ecdsa"
-	"encoding/hex"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -1346,15 +1345,10 @@ func setEtherbase(ctx *cli.Context, cfg *ethconfig.Config) {
 		return
 	}
 	addr := ctx.String(MinerPendingFeeRecipientFlag.Name)
-	if strings.HasPrefix(addr, "0x") || strings.HasPrefix(addr, "0X") {
-		addr = addr[2:]
-	}
-	b, err := hex.DecodeString(addr)
-	if err != nil || len(b) != common.AddressLength {
+	if !common.IsHexAddress(addr) {
 		Fatalf("-%s: invalid pending block producer address %q", MinerPendingFeeRecipientFlag.Name, addr)
-		return
 	}
-	cfg.Miner.PendingFeeRecipient = common.BytesToAddress(b)
+	cfg.Miner.PendingFeeRecipient = common.HexToAddress(addr)
 }
 
 func SetP2PConfig(ctx *cli.Context, cfg *p2p.Config) {