Fix memory leak in UpdateWeights in Cuda

tmva/tmva/src/DNN/Architectures/Cuda/Propagation.cu

@@ -385,6 +385,9 @@ void TCuda<AFloat>::CalculateConvWeightGradients(TCudaMatrix<AFloat> & weightGra
     // Launch the kernel using our device pointers.
     ::TMVA::DNN::Cuda::UpdateWeights<<<gridDims, blockDims>>>(weightGradients.GetDataPointer(), dB, batchSize,
                                                               depth, nLocalViewPixels);
+
+    delete [] hB;
+    cudaFree(dB); 
 }
 
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