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fix USB handle initialization
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@@ -54,7 +54,7 @@ class USB3:
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self._bulk_out_buf, self._bulk_out_mv = alloc_cbuffer(4 << 20)
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bus_number = libusb.libusb_get_bus_number(dev)
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self.handle = c.init_c_var(c.POINTER(libusb.struct_libusb_device_handle), lambda x: checked(libusb.libusb_open)(dev, x))
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self.handle = c.init_c_var(ctypes.POINTER(libusb.struct_libusb_device_handle), lambda x: checked(libusb.libusb_open)(dev, x))
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libusb.libusb_unref_device(dev)
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# Read product string descriptor
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