iio: core: remove extra semi-colon from devm_iio_device_register() macro

This change removes the semi-colon from the devm_iio_device_register()
macro which seems to have been added by accident.

Fixes: 63b19547 ("iio: Use macro magic to avoid manual assign of driver_module")
Signed-off-by: Lars Engebretsen <lars@engebretsen.ch>
Cc: <Stable@vger.kernel.org>
Reviewed-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>