commit 1c3816a1 upstream.

The of_find_device_by_node() takes a reference to the underlying device
structure, we should release that reference.

Fixes: 7dd0d835 ("ASoC: stm32: sai: simplify sync modes management")
Signed-off-by: NWen Yang <yellowriver2010@hotmail.com>
Acked-by: NOlivier Moysan <olivier.moysan@st.com>
Signed-off-by: NMark Brown <broonie@kernel.org>
Signed-off-by: NMathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>