These tests do nothing additional compared to the other test,
so let's remove the empty functions to avoid wasting some few
precious test cycles here.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>