Staging: rtl8723au: Add blank line after declarations

WARNING: "Missing a blank line after declarations"
Add blank line after declarations. That was found by running checkpatch
Signed-off-by: Melike Yurtoglu <aysemelikeyurtoglu@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723au/os_dep/usb_intf.c

@@ -237,6 +237,7 @@ void rtl8723a_usb_intf_stop(struct rtw_adapter *padapter)
 static void rtw_dev_unload(struct rtw_adapter *padapter)
 {
 	struct submit_ctx *pack_tx_ops = &padapter->xmitpriv.ack_tx_ops;
+
 	RT_TRACE(_module_hci_intfs_c_, _drv_err_, ("+rtw_dev_unload\n"));
 
 	if (padapter->bup) {