MDEV-11930 Unexpected ER_ERROR_EVALUATING_EXPRESSION warning upon dropping...

MDEV-11930 Unexpected ER_ERROR_EVALUATING_EXPRESSION warning upon dropping database with a bad table

DBUG_EXECUTE_IF was wrong, it used my_error, but didn't do error=1.

It's not clear what it was actually testing, what it was supposed
to be testing, and what it has to do with bug#43138, so I removed it.

mysql-test/r/drop_debug.result

-
-# --
-# -- Bug#43138: DROP DATABASE failure does not clean up message list.
-# --
-
-DROP DATABASE IF EXISTS mysql_test;
-
-CREATE DATABASE mysql_test;
-CREATE TABLE mysql_test.t1(a INT);
-CREATE TABLE mysql_test.t2(b INT);
-CREATE TABLE mysql_test.t3(c INT);
-
-SET SESSION debug_dbug= "+d,bug43138";
-
-DROP DATABASE mysql_test;
-Warnings:
-Error	1051	Unknown table 't1'
-Error	1051	Unknown table 't2'
-Error	1051	Unknown table 't3'
-
-SET SESSION debug_dbug= "-d,bug43138";
-
-# --
-# -- End of Bug#43138.
-# --

mysql-test/t/drop_debug.test

-# 
-# DROP-related tests which execution requires debug server.
-#
---source include/have_debug.inc
-
-###########################################################################
---echo
---echo # --
---echo # -- Bug#43138: DROP DATABASE failure does not clean up message list.
---echo # --
---echo
-
---disable_warnings
-DROP DATABASE IF EXISTS mysql_test;
---enable_warnings
-
---echo
-CREATE DATABASE mysql_test;
-CREATE TABLE mysql_test.t1(a INT);
-CREATE TABLE mysql_test.t2(b INT);
-CREATE TABLE mysql_test.t3(c INT);
-
---echo
-SET SESSION debug_dbug= "+d,bug43138";
-
---echo
---sorted_result
-DROP DATABASE mysql_test;
-
---echo
-SET SESSION debug_dbug= "-d,bug43138";
-
---echo
---echo # --
---echo # -- End of Bug#43138.
---echo # --
-
-###########################################################################

sql/sql_table.cc

@@ -2522,10 +2522,6 @@ int mysql_rm_table_no_locks(THD *thd, TABLE_LIST *tables, bool if_exists,
 
     DBUG_PRINT("table", ("table: 0x%lx  s: 0x%lx", (long) table->table,
                          table->table ? (long) table->table->s : (long) -1));
-
-    DBUG_EXECUTE_IF("bug43138",
-                    my_error(ER_BAD_TABLE_ERROR, MYF(0),
-                                    table->table_name););
   }
   DEBUG_SYNC(thd, "rm_table_no_locks_before_binlog");
   thd->thread_specific_used|= (trans_tmp_table_deleted ||