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Return error in case no callback is provided to `iio_channel_get_all_cb()`. There's no point in setting up a buffer-cb if no callback is provided. Signed-off-by: Nuno Sá <nuno.sa@analog.com> Reviewed-by: Olivier Moysan <olivier.moysan@st.com> Link: https://lore.kernel.org/r/20201121161457.957-3-nuno.sa@analog.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>