ALSA: snd-usb-caiaq: switch to dev_*() logging

Get rid of the proprietary functions log() and debug() and use the
generic dev_*() approach. A macro is needed to cast a cdev to a struct
device *.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/usb/caiaq/control.c b/sound/usb/caiaq/control.c
index 2c51959..ae6b50f 100644
--- a/sound/usb/caiaq/control.c
+++ b/sound/usb/caiaq/control.c
@@ -17,6 +17,7 @@
  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  */
 
+#include <linux/device.h>
 #include <linux/init.h>
 #include <linux/usb.h>
 #include <sound/control.h>