MDEV-9758: correct test case

mysql-test/r/myisam.result

@@ -604,9 +604,9 @@ test.t3	NULL
 Warnings:
 Error	1146	Table 'test.t3' doesn't exist
 alter table t1 add d int default 30, add e bigint default 300000, add f decimal(30) default 442;
-checksum table t2;
+checksum table t1;
 Table	Checksum
-test.t2	3442722830
+test.t1	2924214226
 drop table t1,t2;
 create table t1 (a int, key (a));
 show keys from t1;

mysql-test/t/myisam.test

@@ -553,7 +553,7 @@ checksum table t1, t2, t3 quick;
 checksum table t1, t2, t3;
 checksum table t1, t2, t3 extended;
 alter table t1 add d int default 30, add e bigint default 300000, add f decimal(30) default 442;
-checksum table t2;
+checksum table t1;
 #show table status;
 drop table t1,t2;