COMPMID-424 NEON/CL Harris Corners validation tests.

Change-Id: I82d2a73f515a8d45d16b9ddb702fea51ae05c82e
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/79687
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
Reviewed-by: Moritz Pflanzer <moritz.pflanzer@arm.com>
diff --git a/src/core/NEON/kernels/NEMeanStdDevKernel.cpp b/src/core/NEON/kernels/NEMeanStdDevKernel.cpp
index 1eb7e45..579c46f 100644
--- a/src/core/NEON/kernels/NEMeanStdDevKernel.cpp
+++ b/src/core/NEON/kernels/NEMeanStdDevKernel.cpp
@@ -110,8 +110,7 @@
 
     constexpr unsigned int num_elems_processed_per_iteration = 16;
 
-    _border_size = BorderSize(std::max(static_cast<int>(num_elems_processed_per_iteration) - static_cast<int>(input->info()->dimension(0)),
-                                       static_cast<int>(input->info()->dimension(0) % num_elems_processed_per_iteration)));
+    _border_size = BorderSize(ceil_to_multiple(input->info()->dimension(0), num_elems_processed_per_iteration) - input->info()->dimension(0));
 
     // Configure kernel window
     Window win = calculate_max_window(*input->info(), Steps(num_elems_processed_per_iteration));