tdf#120794 crash while selecting a drawing line

regression from
    commit b4fc9965
    loplugin:useuniqueptr in SdrHdlList

Change-Id: Ic49c60020b1d86b4c65cc4662393415b96af714e
Reviewed-on: https://gerrit.libreoffice.org/62222
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

svx/source/svdraw/svdmrkv1.cxx

@@ -156,7 +156,6 @@ bool SdrMarkView::ImpMarkPoint(SdrHdl* pHdl, SdrMark* pMark, bool bUnmark)
                 if (pPlusHdl->IsPlusHdl() && pPlusHdl->GetSourceHdlNum()==nHdlNum)
                 {
                     maHdlList.RemoveHdl(i);
-                    delete pPlusHdl;
                 }
             }
         }