func iamPolicyDeleteVersion(arn, versionID string, iamconn *iam.IAM) error {
request := &iam.DeletePolicyVersionInput{
PolicyARN: aws.String(arn),
VersionID: aws.String(versionID),
}
_, err := iamconn.DeletePolicyVersion(request)
if err != nil {
return fmt.Errorf("Error deleting version %s from IAM policy %s: %s", versionID, arn, err)
}
return nil
}