trezor: provide a default interface number.
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@ -455,7 +455,9 @@ class DeviceMgr(PrintError):
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for d in hid.enumerate(0, 0):
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product_key = (d['vendor_id'], d['product_id'])
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if product_key in self.recognised_hardware:
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devices.append(Device(d['path'], d['interface_number'],
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# Older versions of hid don't provide interface_number
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interface_number = d.get('interface_number', 0)
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devices.append(Device(d['path'], interface_number,
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d['serial_number'], product_key))
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# Now find out what was disconnected
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