gianfar: ethtool: Fix refcount leak in gfar_get_ts_info

stable inclusion
from stable-v4.19.235
commit 6263f2eb93a85ad7df504daf0c341a7fb6bbe8a6
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/IADGRU
CVE: CVE-2022-48856

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=6263f2eb93a85ad7df504daf0c341a7fb6bbe8a6



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[ Upstream commit 2ac5b58e ]

The of_find_compatible_node() function returns a node pointer with
refcount incremented, We should use of_node_put() on it when done
Add the missing of_node_put() to release the refcount.

Fixes: 7349a74e ("net: ethernet: gianfar_ethtool: get phc index through drvdata")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Reviewed-by: Claudiu Manoil <claudiu.manoil@nxp.com>
Link: https://lore.kernel.org/r/20220310015313.14938-1-linmq006@gmail.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>