ALSA: usb: caiaq: audio: don't print error when allocating urb fails

kmalloc will print enough information in case of failure.
Signed-off-by: Wolfram Sang <wsa-dev@sang-engineering.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/caiaq/audio.c

@@ -739,7 +739,6 @@ static struct urb **alloc_urbs(struct snd_usb_caiaqdev *cdev, int dir, int *ret)
 	for (i = 0; i < N_URBS; i++) {
 		urbs[i] = usb_alloc_urb(FRAMES_PER_URB, GFP_KERNEL);
 		if (!urbs[i]) {
-			dev_err(dev, "unable to usb_alloc_urb(), OOM!?\n");
 			*ret = -ENOMEM;
 			return urbs;
 		}