WaE: variable set but not used, in NDEBUG build

Change-Id: I9c88c1a43228a98a355d8ba17b0a06de0c5418c4
(cherry picked from commit c58533fe)
Signed-off-by: Eike Rathke <erack@redhat.com>
Reviewed-on: https://gerrit.libreoffice.org/19700

sc/qa/unit/opencl-test.cxx

@@ -777,6 +777,9 @@ void ScOpenCLTest::testSystematic()
     CPPUNIT_ASSERT(nBHorEnd > 10);
     CPPUNIT_ASSERT(nAHorEnd == nBHorEnd);
 
+    (void) nBVertEnd;
+    (void) nBHorEnd;
+
     for (SCROW i = nAVertBegin; i < nAVertEnd; ++i)
     {
         for (int j = 1; j < nAHorEnd; ++j)