remove unused variable

Change-Id: I22454ef597e679439f6c5b71866022c90823a690
Reviewed-on: https://gerrit.libreoffice.org/58260
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

connectivity/source/drivers/dbase/DIndex.cxx

@@ -253,8 +253,6 @@ bool ODbaseIndex::Delete(sal_uInt32 nRec, const ORowSetValue& rValue)
     if (!ConvertToKey(&aKey, nRec, rValue) || !getRoot()->Find(aKey))
         return false;
 
-    ONDXNode aNewNode(aKey);
-
     // insert in the current leaf
     if (!m_aCurLeaf.Is())
         return false;