branches/zip: ha_innobase::add_index(): Convert the error code before

goto err_exit.  The error handling should be rewritten.  Many of the
error messages contain parameters, but this code is only returning
the error number to MySQL.

handler/ha_innodb.cc

@@ -8376,7 +8376,7 @@ ha_innobase::add_index(
 
 		if (!indexed_table) {
 
-			error = trx->error_state;
+			error = convert_error_code_to_mysql(trx->error_state);
 			row_mysql_unlock_data_dictionary(trx);
 			goto err_exit;
 		}