r8152: clear the flag of SCHEDULE_TASKLET in tasklet

Clear the flag of SCHEDULE_TASKLET in bottom_half() to avoid
re-schedule the tasklet again by workqueue.

Signed-off-by: Hayes Wang <hayeswang@realtek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/usb/r8152.c b/drivers/net/usb/r8152.c
index a300467..ad9dd7d 100644
--- a/drivers/net/usb/r8152.c
+++ b/drivers/net/usb/r8152.c
@@ -1797,6 +1797,8 @@
 	if (!netif_carrier_ok(tp->netdev))
 		return;
 
+	clear_bit(SCHEDULE_TASKLET, &tp->flags);
+
 	rx_bottom(tp);
 	tx_bottom(tp);
 }