ALSA: core - Refactor card id string creation code
The code to handle the card id string is fairly messy, so here is a
tidy up.
Signed-off-by: 
Takashi Iwai <tiwai@suse.de>
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The code to handle the card id string is fairly messy, so here is a
tidy up.
Signed-off-by: Takashi Iwai <tiwai@suse.de>