workqueue: Cleanups around process_scheduled_works()

* Drop the trivial optimization in worker_thread() where it bypasses calling
  process_scheduled_works() if the first work item isn't linked. This is a
  mostly pointless micro optimization and gets in the way of improving the
  work processing path.

* Consolidate pool->watchdog_ts updates in the two callers into
  process_scheduled_works().

Signed-off-by: Tejun Heo <tj@kernel.org>

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