Make `required_without` work with pointer

Fix #483, #473

baked_in.go

@@ -1308,8 +1308,12 @@ func hasValue(fl FieldLevel) bool {
 func requireCheckFieldKind(fl FieldLevel, param string) bool {
 	field := fl.Field()
 	if len(param) > 0 {
+		if fl.Parent().Kind() == reflect.Ptr {
+			field = fl.Parent().Elem().FieldByName(param)
+		} else {
 			field = fl.Parent().FieldByName(param)
 		}
+	}
 	switch field.Kind() {
 	case reflect.Slice, reflect.Map, reflect.Ptr, reflect.Interface, reflect.Chan, reflect.Func:
 		return !field.IsNil()

validator_test.go

@@ -8712,7 +8712,7 @@ func TestRequiredWithout(t *testing.T) {
 		Field5: "test",
 	}
 
-	errs = validate.Struct(test2)
+	errs = validate.Struct(&test2)
 
 	if errs == nil {
 		t.Fatalf("failed Error: %s", errs)