Fix linter issues.

Author: andreibancioiu

txcache/transactionsHeapItem.go

@@ -166,7 +166,7 @@ func (item *transactionsHeapItem) detectBadlyGuarded() bool {
 	transactionGuardian := item.currentTransaction.Guardian
 	accountGuardian := item.senderState.Guardian
 
-	isBadlyGuarded := bytes.Compare(transactionGuardian, accountGuardian) != 0
+	isBadlyGuarded := !bytes.Equal(transactionGuardian, accountGuardian)
 	if isBadlyGuarded {
 		logSelect.Trace("transactionsHeapItem.detectBadlyGuarded",
 			"tx", item.currentTransaction.TxHash,

txcache/transactionsHeapItem_test.go

@@ -326,8 +326,8 @@ func TestTransactionsHeapItem_requestAccountStateIfNecessary(t *testing.T) {
 
 	c := &transactionsHeapItem{}
 
-	a.requestAccountStateIfNecessary(accountStateProvider)
-	b.requestAccountStateIfNecessary(accountStateProvider)
+	_ = a.requestAccountStateIfNecessary(accountStateProvider)
+	_ = b.requestAccountStateIfNecessary(accountStateProvider)
 
 	require.Equal(t, uint64(7), a.senderState.Nonce)
 	require.Equal(t, uint64(42), b.senderState.Nonce)