hid.class: ignore zero-length input reports#806
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A zero-length reply (USB ZLP, buflen 0) means the device has nothing to report. Guard the Wacom-validity check with buflen > 0 so an empty report is no longer mistaken for a bad packet.
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A zero-length reply (USB ZLP, buflen 0) means the device has nothing to report. Guard the Wacom-validity check with buflen > 0 so an empty report is no longer mistaken for a bad packet.