[ALSA] Add missing KERN_* prefix

Modules: ALSA<-OSS emulation,USB generic driver,USB USX2Y

Added missing KERN_* prefix to printk.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
index c3c08c9..e570d14 100644
--- a/sound/usb/usbmixer.c
+++ b/sound/usb/usbmixer.c
@@ -911,7 +911,7 @@
 	case USB_ID(0x0672, 0x1041):
 		if (!strcmp(kctl->id.name, "PCM Playback Volume") &&
 		    cval->min == -15616) {
-			snd_printk("using volume control quirk for the UDA1321/N101 chip\n");
+			snd_printk(KERN_INFO "using volume control quirk for the UDA1321/N101 chip\n");
 			cval->max = -256;
 		}
 	}