mitsup9x: Fix an inverted test.
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@ -155,7 +155,7 @@ static int mitsup95d_attach(void *vctx, struct libusb_device_handle *dev, int ty
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udev = libusb_get_device(ctx->dev);
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libusb_get_device_descriptor(udev, &desc);
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if (desc.iSerialNumber) {
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if (!desc.iSerialNumber) {
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WARNING("Printer configured for iSerial mode U0, so no serial number is reported.\n");
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} else {
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libusb_get_string_descriptor_ascii(ctx->dev, desc.iSerialNumber, (uint8_t*)ctx->serno, STR_LEN_MAX);
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