tools: iio: make scale and offset files optional
Make scale and offset optional by adding -ENOENT check as not all drivers implement them. Signed-off-by: NJoo Aun Saw <jasaw@dius.com.au> Acked-by: NHartmut Knaack <knaack.h@gmx.de> Signed-off-by: NJonathan Cameron <jic23@kernel.org>
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