Fix free() after my_malloc() (should be my_free()).

Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>

tests/async_queries.c

@@ -425,7 +425,7 @@ main(int argc, char *argv[])
 
   event_dispatch();
 
-  free(sds);
+  my_free(sds);
 
   mysql_library_end();