coverity#1437526 Unchecked return value

Change-Id: Ib1dbc34ff728475bc6473d315daa08ce13c6aa84
Reviewed-on: https://gerrit.libreoffice.org/56442
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sc/source/filter/excel/xipivot.cxx

@@ -1485,7 +1485,7 @@ void XclImpPivotTable::Convert()
     pDPObj->SetOutRange( aOutRange );
     pDPObj->SetHeaderLayout( maPTViewEx9Info.mnGridLayout == 0 );
 
-    GetDoc().GetDPCollection()->InsertNewTable(pDPObj);
+    (void)GetDoc().GetDPCollection()->InsertNewTable(pDPObj);
     mpDPObj = pDPObj;
 
     ApplyFieldInfo();