qcom_smd_parse_edge() stores an extra reference to the edge's device
node in edge->of_node, and it is used after probe by
qcom_smd_match_channel(). The error path drops that reference, but the
success path does not, and qcom_smd_edge_release() only frees the edge,
so the reference is leaked when the edge is unregistered.

Release the device node when the edge is freed.

Fixes: 53e2822e56c7 ("rpmsg: Introduce Qualcomm SMD backend")
Cc: stable@vger.kernel.org
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
---
 drivers/rpmsg/qcom_smd.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/rpmsg/qcom_smd.c b/drivers/rpmsg/qcom_smd.c
index 3ac863f400ec..d98e8bbf9bd2 100644
--- a/drivers/rpmsg/qcom_smd.c
+++ b/drivers/rpmsg/qcom_smd.c
@@ -1452,6 +1452,7 @@ static void qcom_smd_edge_release(struct device *dev)
 		kfree(channel);
 	}
 
+	of_node_put(edge->of_node);
 	kfree(edge);
 }
 
-- 
2.34.1