Fix test failure on innodb_stats_fetch_nonexistent.

mysql-test/suite/innodb/r/innodb_stats_fetch_nonexistent.result

+call mtr.add_suppression("InnoDB: Error: Fetch of persistent statistics requested for table *");
 CREATE TABLE test_ps_fetch_nonexistent
 (a INT, PRIMARY KEY (a))
 ENGINE=INNODB STATS_PERSISTENT=1;

mysql-test/suite/innodb/t/innodb_stats_fetch_nonexistent.test

@@ -4,6 +4,8 @@
 
 -- source include/have_innodb.inc
 
+call mtr.add_suppression("InnoDB: Error: Fetch of persistent statistics requested for table *");
+
 -- vertical_results
 
 CREATE TABLE test_ps_fetch_nonexistent