The comments describes the device as being 32-bit: "the maximum time span is just over 136 years" then uses a UINTN to hold the value. Change to UINT32 so we don't get different behaviour for different architectures. Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>