ALSA: dice: suppress checkpatch.pl warnings

The checkpatch.pl generates some warnings due to:
 - C99 comment
 - a line over 80 characters
 - min() for parameters with different types

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>