Now
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usbnet: Omit needless locking/busying/testing in usbnet_tick_task.
usbnet_stop waits for the task to complete before resetting the
hardware, and usbnet_detach waits for usbnet_stop to complete before
destroying anything, so there's no need for any of this.
usbnet_stop waits for the task to complete before resetting the
hardware, and usbnet_detach waits for usbnet_stop to complete before
destroying anything, so there's no need for any of this.