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Sashiko pointed that this sample code does not correctly handle the
failure of thread creation because kthread_run() can return -errno.
Check the simple_tsk_fn is correctly initialized (created) or not.
Link: https://lore.kernel.org/all/178165817322.269421.3992299509400184196.stgit@devnote2/
Link: https://sashiko.dev/#/patchset/178092865666.163648.10457567771536160909.stgit%40devnote2
Fixes: 9cfe06f8cd ("tracing/events: add trace-events-sample")
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>