kselftest: alsa: Validate values read from enumerations

Enumerations should return a value between 0 and items-1, check that this
is the case.

Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20211217130213.3893415-3-broonie@kernel.org


Signed-off-by: Takashi Iwai <tiwai@suse.de>