Bug#40636 falcon_bug_28095 test fails with "Server failed to restart"

mysql-test/include/wait_until_disconnected.inc:
  Change the default value for $mysql_errno so that the loops is run at least once

mysql-test/include/wait_until_disconnected.inc

@@ -4,7 +4,7 @@
 --disable_result_log
 --disable_query_log
 let $counter= 500;
-let $mysql_errno= 9999;
+let $mysql_errno= 0;
 while (!$mysql_errno)
 {
   --error 0,1053,2002,2006