Define SubDevicesScopeGuarded in the harness and remove duplicate copies (#2379)

Signed-off-by: Kévin Petit <kpet@free.fr>

test_common/harness/typeWrappers.h

@@ -377,4 +377,24 @@ public:
     size_t getSize() const { return allocsize; };
 };
 
+// scope guard helper to ensure proper releasing of sub devices
+struct SubDevicesScopeGuarded
+{
+    SubDevicesScopeGuarded(const cl_int dev_count)
+    {
+        sub_devices.resize(dev_count);
+    }
+    ~SubDevicesScopeGuarded()
+    {
+        for (auto &device : sub_devices)
+        {
+            cl_int err = clReleaseDevice(device);
+            if (err != CL_SUCCESS)
+                log_error("\n Releasing sub-device failed \n");
+        }
+    }
+
+    std::vector<cl_device_id> sub_devices;
+};
+
 #endif // _typeWrappers_h