COMPMID-3234 CLDirectConvolutionLayer QASYMM8 NHWC mismatches

Change-Id: Ic29d20d77fe0a77c28a635132a69a2609a3dcc1a
Signed-off-by: Giorgio Arena <giorgio.arena@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/2815
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
diff --git a/src/runtime/CL/functions/CLDirectConvolutionLayer.cpp b/src/runtime/CL/functions/CLDirectConvolutionLayer.cpp
index bfc6ff1..9828cd1 100644
--- a/src/runtime/CL/functions/CLDirectConvolutionLayer.cpp
+++ b/src/runtime/CL/functions/CLDirectConvolutionLayer.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2019 ARM Limited.
+ * Copyright (c) 2017-2020 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -49,7 +49,7 @@
     PixelValue &&zero_value(0.f);
     if(is_data_type_quantized_asymmetric(input->info()->data_type()))
     {
-        zero_value = PixelValue(static_cast<uint8_t>(input->info()->quantization_info().uniform().offset));
+        zero_value = PixelValue(0, input->info()->data_type(), input->info()->quantization_info());
     }
     _input_border_handler.configure(input, _direct_conv_kernel.border_size(), BorderMode::CONSTANT, zero_value);