branches/innodb+: row_upd_sec_index_entry(): Pass the BTR_DELETE_MARK

flag to row_search_index_entry() when there are no foreign key
constraints.  This flag was accidentally omitted when the delete buffering
was merged from branches/fts in r2324, and thus delete marking was never
buffered.

row/row0upd.c

@@ -1444,7 +1444,7 @@ row_upd_sec_index_entry(
 	}
 
 	found = row_search_index_entry(
-		&was_buffered, index, entry, BTR_MODIFY_LEAF, &pcur, &mtr);
+		&was_buffered, index, entry, mode, &pcur, &mtr);
 
 	if (was_buffered) {
 		/* Entry was delete marked already. */