iio:adc:ad7923: Rewrite comparison to NULL

Solves checkpath.pl's message:

CHECK: Comparison to NULL could be written "!indio_dev"

Signed-off-by: Bárbara Fernandes <barbara.fernandes@usp.br>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Bárbara Fernandes 2019-02-22 17:31:59 -03:00 • committed by Jonathan Cameron
commit 0a39ac29e0