COMPMID-500: Move HarrisCorners to new validation

Change-Id: I4e21ad98d029e360010c5927f04b716527700a00
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/88888
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
diff --git a/arm_compute/core/Window.inl b/arm_compute/core/Window.inl
index 6b02128..e46a0ec 100644
--- a/arm_compute/core/Window.inl
+++ b/arm_compute/core/Window.inl
@@ -114,7 +114,7 @@
     for(size_t i = 0; i < Coordinates::num_max_dimensions; ++i)
     {
         ARM_COMPUTE_ERROR_ON(_dims[i].step() == 0);
-        ARM_COMPUTE_ERROR_ON(_dims[i].end() <= _dims[i].start());
+        ARM_COMPUTE_ERROR_ON(_dims[i].end() < _dims[i].start());
         ARM_COMPUTE_ERROR_ON((_dims[i].end() - _dims[i].start()) % _dims[i].step());
     }
 }