It claims some use after free

Signed-off-by: Krzysztof Lecki <klecki@nvidia.com>

Author: klecki

include/dali/core/dev_string.h

@@ -1,4 +1,4 @@
-// Copyright (c) 2019, NVIDIA CORPORATION. All rights reserved.
+// Copyright (c) 2019-2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -51,6 +51,7 @@ struct DeviceString {
 
   __device__ void clear() {
     if (length_) {
+      // NOLINTNEXTLINE
       free(data_);
       data_ = nullptr;
       length_ = 0;