Bug#16027468 ADDRESSSANITIZER BUG IN MYSQLTEST

DBUG_ENTER and DBUG_LEAVE must *always* match,
otherwise all subsequent DBUG_ENTER calls will 
be poking into undefined stack frames.

client/mysqltest.cc

@@ -1168,7 +1168,7 @@ void close_files()
 void free_used_memory()
 {
   uint i;
-  DBUG_ENTER("free_used_memory");
+  // Do not use DBUG_ENTER("free_used_memory"); here, see below.
 
   if (connections)
     close_connections();
@@ -1206,7 +1206,6 @@ void free_used_memory()
     mysql_server_end();
 
   /* Don't use DBUG after mysql_server_end() */
-  DBUG_VIOLATION_HELPER_LEAVE;
   return;
 }