tdf#89387 Change summing loop to SumSquare method

Change-Id: I996a984763f9fece9074f8bc318db25f01b8f4ed
Reviewed-on: https://gerrit.libreoffice.org/14954Tested-by: David Tardon <dtardon@redhat.com>
Reviewed-by: David Tardon <dtardon@redhat.com>

sc/source/core/tool/interpr5.cxx

@@ -1786,14 +1786,8 @@ void ScInterpreter::ScSumXMY2()
     }
     else
     {
-        double fVal, fSum = 0.0;
-        SCSIZE nCount = pResMat->GetElementCount();
-        for (SCSIZE i = 0; i < nCount; i++)
-            if (!pResMat->IsString(i))
-            {
-                fVal = pResMat->GetDouble(i);
-                fSum += fVal * fVal;
-            }
+        ScMatrix::IterateResult aRes = pResMat->SumSquare(false);
+        double fSum = aRes.mfRest;
         PushDouble(fSum);
     }
 }