iio: Fix indentation for multiline conditional.

As reported by checkpatch.pl make indentation match previous
conditional.
Signed-off-by: Joe Simmons-Talbott <joetalbott@gmail.com>
Link: https://lore.kernel.org/r/20220727181855.589052-3-joetalbott@gmail.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>