drm/rockchip: lvds: add missing of_node_put

The device node iterators perform an of_node_get on each iteration, so a
jump out of the loop requires an of_node_put.

The semantic patch that fixes this problem is as follows
(http://coccinelle.lip6.fr):

// <smpl>
@@
expression root,e;
local idexpression child;
iterator name for_each_child_of_node;
@@

 for_each_child_of_node(root, child) {
   ... when != of_node_put(child)
       when != e = child
+  of_node_put(child);
?  break;
   ...
}
... when != child
// </smpl>

Fixes: 34cc0aa2 ("drm/rockchip: Add support for Rockchip Soc LVDS")
Cc: stable@vger.kernel.org
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/1527102436-13447-6-git-send-email-Julia.Lawall@lip6.fr

drivers/gpu/drm/rockchip/rockchip_lvds.c

@@ -363,8 +363,10 @@ static int rockchip_lvds_bind(struct device *dev, struct device *master,
 		of_property_read_u32(endpoint, "reg", &endpoint_id);
 		ret = drm_of_find_panel_or_bridge(dev->of_node, 1, endpoint_id,
 						  &lvds->panel, &lvds->bridge);
-		if (!ret)
+		if (!ret) {
+			of_node_put(endpoint);
 			break;
+		}
 	}
 	if (!child_count) {
 		DRM_DEV_ERROR(dev, "lvds port does not have any children\n");