media: qcom: camss: simplify camss_subdev_notifier_complete() function

For sake of code simplicity and readability reduce the function code by
one level of indentation, the change is non-functional.

Signed-off-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
[bod: Fixed indentation error]
Signed-off-by: Bryan O'Donoghue <bod@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>