soc: sifive: ccache: fix missing of_node_put() in sifive_ccache_init()

soc: sifive: ccache: fix missing of_node_put() in sifive_ccache_init()

[ Upstream commit 8fbf94fea0b4e187ca9100936c5429f96b8a4e44 ]

The device_node pointer returned by of_find_matching_node() with
refcount incremented, when finish using it, the refcount need be
decreased.

Fixes: a967a289f169 ("RISC-V: sifive_l2_cache: Add L2 cache controller driver for SiFive SoCs")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>