fix bug with rndis overshadow the normal cdc callback

tinyusb/class/cdc_host.c

@@ -204,8 +204,8 @@ tusb_error_t cdch_open_subtask(uint8_t dev_addr, tusb_descriptor_interface_t con
   {
     OSAL_SUBTASK_INVOKED_AND_WAIT( rndish_open_subtask(dev_addr, p_cdc), error );
   }
-  else
-//  if ( TUSB_ERROR_NONE != error ) // device is not an rndis
+
+  if ( !(0xff == p_cdc->interface_protocol && TUSB_ERROR_NONE == error) ) // device is not an rndis
 #endif
 
   // FIXME mounted class flag is not set yet

tinyusb/class/cdc_rndis_host.c

@@ -116,6 +116,11 @@ tusb_error_t rndish_open_subtask(uint8_t dev_addr, cdch_data_t *p_cdc)
     error
   );
 
+  if ( TUSB_ERROR_NONE != error)
+  {
+    SUBTASK_EXIT(error);
+  }
+
   if ( tusbh_cdc_rndis_mounted_cb )
   {
     tusbh_cdc_rndis_mounted_cb(dev_addr);