iio: adc: meson-saradc: Add missing space between if and parenthesis

Add a missing space between if and the opening parenthesis to make the
coding style consistent across the whole driver. No functional changes
intended.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20210717233718.332267-3-martin.blumenstingl@googlemail.com


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>