ALSA: usb-audio: remove invalid extra mixers for Komplete Audio 6

This was a flaw in the reading of the spec tables - Native Instrument's
"Komplete Audio 6" device has no such extra controls.

This patch also fixes the device name in two comments.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/quirks.c

@@ -539,7 +539,7 @@ int snd_usb_apply_boot_quirk(struct usb_device *dev,
 		/* Access Music VirusTI Desktop */
 		return snd_usb_accessmusic_boot_quirk(dev);
 
-	case USB_ID(0x17cc, 0x1000): /* Audio Kontrol 6 */
+	case USB_ID(0x17cc, 0x1000): /* Komplete Audio 6 */
 	case USB_ID(0x17cc, 0x1010): /* Traktor Audio 6 */
 	case USB_ID(0x17cc, 0x1020): /* Traktor Audio 10 */
 		return snd_usb_nativeinstruments_boot_quirk(dev);