brcm80211: util: remove pointer traversal from brcmu_pkt_buf_free_skb

The function brcmu_pkt_buf_free_skb() was following the next pointer
to free all linked packets. However, it is only called with unlinked
packets so this can be removed.
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Alwin Beukers <alwin@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/brcm80211/brcmutil/utils.c

@@ -41,14 +41,7 @@ EXPORT_SYMBOL(brcmu_pkt_buf_get_skb);
 /* Free the driver packet. Free the tag if present */
 void brcmu_pkt_buf_free_skb(struct sk_buff *skb)
 {
-	struct sk_buff *nskb;
-	int nest = 0;
-
-	/* perversion: we use skb->next to chain multi-skb packets */
-	while (skb) {
-		nskb = skb->next;
-		skb->next = NULL;
-
+	WARN_ON(skb->next);
 	if (skb->destructor)
 		/* cannot kfree_skb() on hard IRQ (net/core/skbuff.c) if
 		 * destructor exists
@@ -59,10 +52,6 @@ void brcmu_pkt_buf_free_skb(struct sk_buff *skb)
 		 * does not exist
 		 */
 		dev_kfree_skb(skb);
-
-		nest++;
-		skb = nskb;
-	}
 }
 EXPORT_SYMBOL(brcmu_pkt_buf_free_skb);