COMPMID-417: Set tolerance of 1 for CL HarrisCorners

Change-Id: I7427c92faa0a94bdc35ed1dfbdef5961d63746ef
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/85699
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
diff --git a/tests/validation/CL/HarrisCorners.cpp b/tests/validation/CL/HarrisCorners.cpp
index dca2c79..6370c4d 100644
--- a/tests/validation/CL/HarrisCorners.cpp
+++ b/tests/validation/CL/HarrisCorners.cpp
@@ -178,7 +178,7 @@
 
     // Validate output
     dst.map();
-    validate(dst, ref_dst);
+    validate(dst, ref_dst, 1);
     dst.unmap();
 }