a75c47e5ac105d7af4c0ab170d7e83f6588a6852
As with w_task, this ensures that the field remains cleared if it is not used. Without this, worker_stop could mistakenly identify a thread as talking to a device driver rather than a (crashed) file server. Change-Id: I7d3ebed3efc3cd4f5c891f61c67a6463109b6376
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