net: usb: rtl8150: remove set but not used variable 'rx_stat'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/net/usb/rtl8150.c: In function 'read_bulk_callback':
drivers/net/usb/rtl8150.c:391:6: warning:
 variable 'rx_stat' set but not used [-Wunused-but-set-variable]
Signed-off-by: Yue Haibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/usb/rtl8150.c

@@ -388,7 +388,6 @@ static void read_bulk_callback(struct urb *urb)
 	unsigned pkt_len, res;
 	struct sk_buff *skb;
 	struct net_device *netdev;
-	u16 rx_stat;
 	int status = urb->status;
 	int result;
 	unsigned long flags;
@@ -424,7 +423,6 @@ static void read_bulk_callback(struct urb *urb)
 		goto goon;
 
 	res = urb->actual_length;
-	rx_stat = le16_to_cpu(*(__le16 *)(urb->transfer_buffer + res - 4));
 	pkt_len = res - 4;
 
 	skb_put(dev->rx_skb, pkt_len);