skb_array: use __ptr_ring_empty

__skb_array_empty should use __ptr_ring_empty since that's the only
legal lockless function.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/skb_array.h

@@ -69,7 +69,7 @@ static inline int skb_array_produce_any(struct skb_array *a, struct sk_buff *skb
  */
 static inline bool __skb_array_empty(struct skb_array *a)
 {
-	return !__ptr_ring_peek(&a->ring);
+	return __ptr_ring_empty(&a->ring);
 }
 
 static inline struct sk_buff *__skb_array_peek(struct skb_array *a)