Bug #56947 InnoDB leaks memory when failing to create a table

No mysql-test case. Tested by creating a table, removing a *.frm file and
attempting to create the table again. Code coverage tested by
instrumentation. Tested with Valgrind.

storage/innobase/row/row0mysql.c

@@ -1981,6 +1981,7 @@ row_create_table_for_mysql(
 		table already exists */
 
 		trx->error_state = DB_SUCCESS;
+		dict_mem_table_free(table);
 	}
 
 	que_graph_free((que_t*) que_node_get_parent(thr));