You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: error_windows.go
    path of file: ./repos/cloud-torrent/vendor/github.com/go-ole/go-ole
    
    the code of the file until where you have to start completion: // +build windows

package ole


    
func errstr(errno int) string {
	// ask windows for the remaining errors
	var flags uint32 = syscall.FORMAT_MESSAGE_FROM_SYSTEM | syscall.FORMAT_MESSAGE_ARGUMENT_ARRAY | syscall.FORMAT_MESSAGE_IGNORE_INSERTS
	b := make([]uint16, 300)
	n, err := syscall.FormatMessage(flags, 0, uint32(errno), 0, b, nil)
	if err != nil {
		return fmt.Sprintf("error %d (FormatMessage failed with: %v)", errno, err)
	}
	// trim terminating \r and \n
	for ; n > 0 && (b[n-1] == '\n' || b[n-1] == '\r'); n-- {
	}
	return string(utf16.Decode(b[:n]))
}