ALSA: snd-usb: use list_for_each_safe for endpoint resources

snd_usb_endpoint_free() frees the structure that contains its argument.
Signed-off-by: NPavel Roskin <proski@gnu.org>
Cc: stable@vger.kernel.org
Signed-off-by: NTakashi Iwai <tiwai@suse.de>

sound/usb/card.c

@@ -553,7 +553,7 @@ static void snd_usb_audio_disconnect(struct usb_device *dev,
 				     struct snd_usb_audio *chip)
 {
 	struct snd_card *card;
-	struct list_head *p;
+	struct list_head *p, *n;
 
 	if (chip == (void *)-1L)
 		return;
@@ -570,7 +570,7 @@ static void snd_usb_audio_disconnect(struct usb_device *dev,
 			snd_usb_stream_disconnect(p);
 		}
 		/* release the endpoint resources */
-		list_for_each(p, &chip->ep_list) {
+		list_for_each_safe(p, n, &chip->ep_list) {
 			snd_usb_endpoint_free(p);
 		}
 		/* release the midi resources */