ALSA: usb: caiaq: check for cdev->n_streams > 1

Coverity spotted a possible DIV0 condition when cdev->n_streams is 0.

Fix this by making sure the value is > 1 in snd_usb_caiaq_audio_init().
Signed-off-by: NDaniel Mack <daniel@zonque.org>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/usb/caiaq/audio.c

@@ -816,6 +816,11 @@ int snd_usb_caiaq_audio_init(struct snd_usb_caiaqdev *cdev)
 		return -EINVAL;
 	}
 
+	if (cdev->n_streams < 2) {
+		dev_err(dev, "bogus number of streams: %d\n", cdev->n_streams);
+		return -EINVAL;
+	}
+
 	ret = snd_pcm_new(cdev->chip.card, cdev->product_name, 0,
 			cdev->n_audio_out, cdev->n_audio_in, &cdev->pcm);