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It can be convenient for other in-kernel drivers to reuse IIO channel labels. Export the iio_read_channel_label function to allow this. The signature is different depending on where we are calling it from, so the meat is moved to do_iio_read_channel_label. Signed-off-by: Sean Anderson <sean.anderson@linux.dev> Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Link: https://patch.msgid.link/20240624174601.1527244-2-sean.anderson@linux.dev Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>