MDEV-18867: Remove an orphan function

Author: vlad-lesin

storage/innobase/fts/fts0fts.cc

@@ -5746,22 +5746,6 @@ fts_savepoint_rollback(
 }
 }
 
-/*********************************************************************//**
-Compare two fts_aux_table_t parent_ids.
-@return < 0 if n1 < n2, 0 if n1 == n2, > 0 if n1 > n2 */
-UNIV_INLINE
-int
-fts_check_aux_table_parent_id_cmp(
-/*==============================*/
-const void*	p1,/*!< in: id1 */
-const void*	p2)/*!< in: id2 */
-{
-const fts_aux_table_t*	fa1 = static_cast<const fts_aux_table_t*>(p1);
-const fts_aux_table_t*	fa2 = static_cast<const fts_aux_table_t*>(p2);
-
-return static_cast<int>(fa1->parent_id - fa2->parent_id);
-}
-
 bool fts_check_aux_table(const char *name,
  table_id_t *table_id,
  index_id_t *index_id)