all: fix ineffectual assignments and remove uses of crypto.Sha3

go get github.com/gordonklaus/ineffassign
ineffassign .

accounts/abi/bind/base.go

@@ -170,7 +170,7 @@ func (c *BoundContract) transact(opts *TransactOpts, contract *common.Address, i
 	if value == nil {
 		value = new(big.Int)
 	}
-	nonce := uint64(0)
+	var nonce uint64
 	if opts.Nonce == nil {
 		nonce, err = c.transactor.PendingNonceAt(ensureContext(opts.Context), opts.From)
 		if err != nil {

accounts/accounts_test.go

@@ -115,6 +115,9 @@ func TestTimedUnlock(t *testing.T) {
 
 	pass := "foo"
 	a1, err := am.NewAccount(pass)
+	if err != nil {
+		t.Fatal(err)
+	}
 
 	// Signing without passphrase fails because account is locked
 	_, err = am.Sign(a1.Address, testSigData)
@@ -147,6 +150,9 @@ func TestOverrideUnlock(t *testing.T) {
 
 	pass := "foo"
 	a1, err := am.NewAccount(pass)
+	if err != nil {
+		t.Fatal(err)
+	}
 
 	// Unlock indefinitely.
 	if err = am.TimedUnlock(a1, pass, 5*time.Minute); err != nil {

accounts/presale.go

@@ -22,6 +22,7 @@ import (
 	"crypto/sha256"
 	"encoding/hex"
 	"encoding/json"
+	"errors"
 	"fmt"
 
 	"github.com/ethereum/go-ethereum/crypto"
@@ -53,6 +54,9 @@ func decryptPreSaleKey(fileContent []byte, password string) (key *Key, err error
 		return nil, err
 	}
 	encSeedBytes, err := hex.DecodeString(preSaleKeyStruct.EncSeed)
+	if err != nil {
+		return nil, errors.New("invalid hex in encSeed")
+	}
 	iv := encSeedBytes[:16]
 	cipherText := encSeedBytes[16:]
 	/*