[PATCH] rpi_touchscreen_probe: check for failure case

[Navid Emamdoost]

of_graph_get_next_endpoint may return NULL, so null check is needed.

Signed-off-by: Navid Emamdoost <navid.emamdo...@gmail.com>
---
 drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c 
b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
index 28c0620dfe0f..2e0977e26fab 100644
--- a/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
+++ b/drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c
@@ -399,6 +399,8 @@ static int rpi_touchscreen_probe(struct i2c_client *i2c,
 
        /* Look up the DSI host.  It needs to probe before we do. */
        endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
+       if (!endpoint)
+               return -ENODEV;
        dsi_host_node = of_graph_get_remote_port_parent(endpoint);
        host = of_find_mipi_dsi_host_by_node(dsi_host_node);
        of_node_put(dsi_host_node);
-- 
2.17.1