COMPMID-2432: Fix defects reported by Coverity

Change-Id: I3db7bfffb8da95ca0b6fb0c13fef810756270b49
Signed-off-by: Michalis Spyrou <michalis.spyrou@arm.com>
Reviewed-on: https://review.mlplatform.org/c/1490
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/src/core/CL/kernels/CLComparisonKernel.cpp b/src/core/CL/kernels/CLComparisonKernel.cpp
index 628f9f1..5570ecf 100644
--- a/src/core/CL/kernels/CLComparisonKernel.cpp
+++ b/src/core/CL/kernels/CLComparisonKernel.cpp
@@ -210,8 +210,8 @@
 
         enqueue(queue, *this, slice, lws_hint());
 
-        collapsed.slide_window_slice_3D(slice_input1);
-        collapsed.slide_window_slice_3D(slice_input2);
+        ARM_COMPUTE_UNUSED(collapsed.slide_window_slice_3D(slice_input1));
+        ARM_COMPUTE_UNUSED(collapsed.slide_window_slice_3D(slice_input2));
     }
     while(collapsed.slide_window_slice_3D(slice));
 }