ALSA: usb-audio: convert list_for_each to entry variant

Change occurances of list_for_each into list_for_each_entry where
applicable.

Signed-off-by: Eldad Zack <eldad@fogrefinery.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index 21049b8..b1f687f 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -415,14 +415,12 @@
 					      struct usb_host_interface *alts,
 					      int ep_num, int direction, int type)
 {
-	struct list_head *p;
 	struct snd_usb_endpoint *ep;
 	int is_playback = direction == SNDRV_PCM_STREAM_PLAYBACK;
 
 	mutex_lock(&chip->mutex);
 
-	list_for_each(p, &chip->ep_list) {
-		ep = list_entry(p, struct snd_usb_endpoint, list);
+	list_for_each_entry(ep, &chip->ep_list, list) {
 		if (ep->ep_num == ep_num &&
 		    ep->iface == alts->desc.bInterfaceNumber &&
 		    ep->alt_idx == alts->desc.bAlternateSetting) {