tdf#93102 : resolved crash on enabling image contour

Change-Id: I59a07a62573b8d472d15f8594473e8e8d1077589
Reviewed-on: https://gerrit.libreoffice.org/17758Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

svx/source/dialog/_contdlg.cxx

@@ -299,6 +299,8 @@ SvxSuperContourDlg::~SvxSuperContourDlg()
 
 void SvxSuperContourDlg::dispose()
 {
+    m_pContourWnd->SetUpdateLink( Link<>() );
+
     SvtMiscOptions aMiscOptions;
     aMiscOptions.RemoveListenerLink( LINK(this, SvxSuperContourDlg, MiscHdl) );
     m_pContourWnd.disposeAndClear();