[OpenVINO]Fix memory leak in IsDebugEnabled() under Windows (#5948)

* w

* w

Co-authored-by: modav <modav@microsoft.com>

Author: mosdav

onnxruntime/core/providers/openvino/backend_utils.cc

@@ -26,7 +26,9 @@ bool IsDebugEnabled() {
 #ifdef _WIN32
   size_t env_name_len = 0;
   char* env_name = nullptr;
-  return (_dupenv_s(&env_name, &env_name_len, "ORT_OPENVINO_ENABLE_DEBUG") == 0 && env_name != nullptr);
+  bool res = (_dupenv_s(&env_name, &env_name_len, "ORT_OPENVINO_ENABLE_DEBUG") == 0 && env_name != nullptr);
+  free(env_name);
+  return res;
 #else
   return (std::getenv("ORT_OPENVINO_ENABLE_DEBUG") != nullptr);
 #endif