As of commit bb475230 ("reset: make optional functions really
optional"), the reset framework API calls use NULL pointers to describe
optional, non-present reset controls.

This allows to return errors from reset_control_get_optional and to call
reset_control_(de)assert unconditionally.
Signed-off-by: NPhilipp Zabel <p.zabel@pengutronix.de>
Acked-by: NPatrice Chotard <patrice.chotard@st.com>
Signed-off-by: NSean Young <sean@mess.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>