s4:torture: Fix segfault in multichannel test
The timer for the timeout_cb() handler was created on a memory context
which doesn't get freed, so the timer was still valid when running
the next test and fired there. It was then writing into random memory
leading to segfaults.
Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Thu Dec 1 15:03:19 UTC 2022 on sn-devel-184