ASoC: mediatek: Fix missing of_node_put in mt2701_wm8960_machine_probe

ASoC: mediatek: Fix missing of_node_put in mt2701_wm8960_machine_probe

[ Upstream commit 7ae614851a39ba62da1edeada585c5f26dbe7452 ]

This node pointer is returned by of_parse_phandle() with
refcount incremented in this function.
Calling of_node_put() to avoid the refcount leak.

Fixes: f52a364d826a ("ASoC: mediatek: Add mt2701-wm8960 machine driver")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Link: https://lore.kernel.org/r/20220404093526.30004-1-linmq006@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>