udev_device_get_parent_with_subsystem_devtype(): Clarify documentation
devtype can be NULL, in which case it is ignored for matching.
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@ -577,6 +577,9 @@ struct udev_device *udev_device_get_parent(struct udev_device *udev_device)
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* value, and fill in information from the sys device and the udev
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* database entry.
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*
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* If devtype is NULL, only subsystem is checked, and any devtype will
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* match.
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*
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* The returned the device is not referenced. It is attached to the
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* child device, and will be cleaned up when the child device
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* is cleaned up.
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