clean up lock ptr on obj del :)

SVN revision: 17630

src/bin/e_int_border_locks.c

@@ -136,6 +136,7 @@ static void
 _free_data(E_Config_Dialog *cfd, CFData *cfdata)
 {
    /* Free the cfdata */
+   cfdata->border->border_locks_dialog = NULL;
    free(cfdata);
 }