iio: gyro: check sscanf return value
This patch fixes the checkpatch warnings: WARNING: unchecked sscanf return value Signed-off-by: Ioana Ciornei <ciorneiioana@gmail.com> Acked-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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