* Set the devclass of a device before calling the probe method. This allows   device_printf() etc. to print something intelligible. * Allow device_set_devclass(dev, 0) for clearing the devclass.
* Set the devclass of a device before calling the probe method. This allows
  device_printf() etc. to print something intelligible.
* Allow device_set_devclass(dev, 0) for clearing the devclass.

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