r8152: fix accessing skb after napi_gro_receive

Fix accessing skb after napi_gro_receive which is caused by
commit 47922fcd ("r8152: support skb_add_rx_frag").

Fixes: 47922fcd ("r8152: support skb_add_rx_frag")
Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/usb/r8152.c

@@ -2094,10 +2094,10 @@ static int rx_bottom(struct r8152 *tp, int budget)
 			skb->protocol = eth_type_trans(skb, netdev);
 			rtl_rx_vlan_tag(rx_desc, skb);
 			if (work_done < budget) {
-				napi_gro_receive(napi, skb);
 				work_done++;
 				stats->rx_packets++;
 				stats->rx_bytes += skb->len;
+				napi_gro_receive(napi, skb);
 			} else {
 				__skb_queue_tail(&tp->rx_queue, skb);
 			}