ALSA: emu10k1: use list_move_tail instead of list_del/list_add_tail

Using list_move_tail() instead of list_del() + list_add_tail().

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/pci/emu10k1/memory.c b/sound/pci/emu10k1/memory.c
index 0a43662..ae709c1 100644
--- a/sound/pci/emu10k1/memory.c
+++ b/sound/pci/emu10k1/memory.c
@@ -263,8 +263,8 @@
 	spin_lock_irqsave(&emu->memblk_lock, flags);
 	if (blk->mapped_page >= 0) {
 		/* update order link */
-		list_del(&blk->mapped_order_link);
-		list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head);
+		list_move_tail(&blk->mapped_order_link,
+			       &emu->mapped_order_link_head);
 		spin_unlock_irqrestore(&emu->memblk_lock, flags);
 		return 0;
 	}