Fixed missing initialization

include/aidge/backend/cuda/operator/MulImpl.hpp

@@ -50,7 +50,7 @@ public:
 
 private:
     std::vector<cudnnTensorDescriptor_t> mTensorDesc;
-    cudnnOpTensorDescriptor_t mOpTensorDesc;
+    cudnnOpTensorDescriptor_t mOpTensorDesc = nullptr;
     std::vector<std::shared_ptr<Tensor>> mInputFallbacks;
     std::shared_ptr<Tensor> mOutputGradFallback;