fix goerli factory address (#749)

pkg/settlement/swap/chequebook/factory.go

@@ -161,7 +161,7 @@ func (c *factory) ERC20Address(ctx context.Context) (common.Address, error) {
 func DiscoverFactoryAddress(chainID int64) (common.Address, bool) {
 	if chainID == 5 {
 		// goerli
-		return common.HexToAddress("0x334394E8c891E77b1449084aaDD659920BB25247"), true
+		return common.HexToAddress("0xA6B88705036F2a56807af157c116b7dfCDabf968"), true
 	}
 	return common.Address{}, false
 }

pkg/settlement/swap/chequebook/init.go

@@ -6,8 +6,10 @@ package chequebook
 
 import (
 	"context"
+	"errors"
 	"math/big"
 
+	"github.com/ethereum/go-ethereum/accounts/abi/bind"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethersphere/bee/pkg/logging"
 	"github.com/ethersphere/bee/pkg/storage"
@@ -45,6 +47,25 @@ func Init(
 		if err != storage.ErrNotFound {
 			return nil, err
 		}
+
+		if swapInitialDeposit != 0 {
+			erc20Token, err := erc20BindingFunc(erc20Address, swapBackend)
+			if err != nil {
+				return nil, err
+			}
+
+			balance, err := erc20Token.BalanceOf(&bind.CallOpts{
+				Context: ctx,
+			}, overlayEthAddress)
+			if err != nil {
+				return nil, err
+			}
+
+			if balance.Cmp(big.NewInt(int64(swapInitialDeposit))) < 0 {
+				return nil, errors.New("insufficient token for initial deposit")
+			}
+		}
+
 		// if we don't yet have a chequebook, deploy a new one
 		logger.Info("deploying new chequebook")