bluetooth: fix net lock imbalance in drop casse

Signed-off-by: larry <larry@transtekcorp.com>

wireless/bluetooth/bt_netdev.c

@@ -511,6 +511,8 @@ static void btnet_hci_received(FAR struct bt_buf_s *buf, FAR void *context)
   frame      = buf->frame;
   buf->frame = NULL;
 
+  net_lock();
+
   /* Ignore the frame if the network is not up */
 
   priv = (FAR struct btnet_driver_s *)context;
@@ -556,8 +558,6 @@ static void btnet_hci_received(FAR struct bt_buf_s *buf, FAR void *context)
 
   /* Transfer the frame to the network logic */
 
-  net_lock();
-
 #ifdef CONFIG_NET_BLUETOOTH
   /* Invoke the PF_BLUETOOTH tap first.  If the frame matches
    * with a connected PF_BLUETOOTH socket, it will take the