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When formatting a value using IIO_VAL_FRACTIONAL_LOG2 and the values is between -1 and 0 the sign is omitted. We need the same trick as for IIO_VAL_FRACTIONAL to make sure this gets formatted correctly. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Link: https://lore.kernel.org/r/20201215191743.2725-2-lars@metafoo.de Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>