snd_ctl_add — add the control instance to the card
| int snd_ctl_add ( | struct snd_card * card, | 
| struct snd_kcontrol * kcontrol ); | 
   Adds the control instance created via snd_ctl_new or
   snd_ctl_new1 to the given card. Assigns also an unique
   numid used for fast search.
   
It frees automatically the control which cannot be added.