Bug: when struct has pointer to other struct, processDefaults is not working

[xmlking]

Hot to Reproduce

Change the test case

func TestDefaultValue(t *testing.T) {
	config := generateDefaultConfig()
	config.APPName = ""
	config.DB.Port = 0
	config.DB.SSL = false

	if bytes, err := json.Marshal(config); err == nil {
		if file, err := ioutil.TempFile("/tmp", "configor"); err == nil {
			defer file.Close()
			defer os.Remove(file.Name())
			file.Write(bytes)

			var result testConfig
			Load(&result, file.Name())

			if !reflect.DeepEqual(result, generateDefaultConfig()) {
				t.Errorf("result should be set default value correctly")
			}
		}
	} else {
		t.Errorf("failed to marshal config")
	}
}

** using a pointer to Database**

type Anonymous struct {
	Description string
}

type Database struct {
	Name     string
	User     string `yaml:",omitempty" default:"root"`
	Password string `required:"true" env:"DBPassword"`
	Port     uint   `default:"3306" yaml:",omitempty" json:",omitempty"`
	SSL      bool   `default:"true" yaml:",omitempty" json:",omitempty"`
}

type Contact struct {
	Name  string
	Email string `required:"true"`
}

type testConfig struct {
	APPName   string `default:"configor" yaml:",omitempty" json:",omitempty"`
	Hosts     []string
	DB        *Database
	Contacts  []Contact
	Anonymous `anonymous:"true"`
	private   string
}

func generateDefaultConfig() testConfig {
	return testConfig{
		APPName: "configor",
		Hosts:   []string{"http://example.org", "http://jinzhu.me"},
		DB: &Database{
			Name:     "configor",
			User:     "configor",
			Password: "configor",
			Port:     3306,
			SSL:      true,
		},
		Contacts: []Contact{
			{
				Name:  "Jinzhu",
				Email: "wosmvp@gmail.com",
			},
		},
		Anonymous: Anonymous{
			Description: "This is an anonymous embedded struct whose environment variables should NOT include 'ANONYMOUS'",
		},
	}
}

Root cause

Problem is at https://github.com/jinzhu/configor/blob/master/utils.go#L217

		for field.Kind() == reflect.Ptr {
			field = field.Elem()
		}

after this statement, field.Kind() becomes invalid.