git2go BranchIterator ForEach() bug

git2go_itr_err.go

package main

import (
	"fmt"
	"os"
	"path/filepath"

	"gopkg.in/libgit2/git2go.v24"
)

func main() {
	p := filepath.Join(os.TempDir(), "sample-data")
	err := os.Mkdir(p, 0777)
	if err != nil {
		panic(err)
	}
	repo, err := git.Clone("https://github.com/libgit2/TestGitRepository", p, &git.CloneOptions{})
	if err != nil {
		panic(err)
	}

	itr, err := repo.NewBranchIterator(git.BranchLocal)
	if err != nil {
		panic(err)
	}
	defer itr.Free()

	var f = func(_ *git.Branch, _ git.BranchType) error {
		return nil
	}

	err = itr.ForEach(f) // This doesn't return nil, but instead an empty string
	if err != nil {
		fmt.Printf("Error: %s Length: %d", err.Error(), len(err.Error()))
	}

	defer func() {
		os.RemoveAll(p)
	}()
}