exit/kthread: Have kernel threads return instead of calling do_exit

In 2009 Oleg reworked[1] the kernel threads so that it is not
necessary to call do_exit if you are not using kthread_stop().  Remove
the explicit calls of do_exit and complete_and_exit (with a NULL
completion) that were previously necessary.

[1] 63706172f332 ("kthreads: rework kthread_stop()")
Link: https://lkml.kernel.org/r/20211020174406.17889-12-ebiederm@xmission.com
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>

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