[PATCH v4 1/3] drm/panel: Fix IS_ERR() vs NULL check in nt35950_probe()

[Gaosheng Cui <cuigaosheng1@xxxxxxxxxx>]

The mipi_dsi_device_register_full() returns an ERR_PTR() on failure,
we should use IS_ERR() to check the return value.

By the way, use dev_err_probe instead of dev_err to print the error code.

Fixes: 623a3531e9cf ("drm/panel: Add driver for Novatek NT35950 DSI DriverIC panels")
Signed-off-by: Gaosheng Cui <cuigaosheng1@xxxxxxxxxx>
---
 drivers/gpu/drm/panel/panel-novatek-nt35950.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/panel/panel-novatek-nt35950.c b/drivers/gpu/drm/panel/panel-novatek-nt35950.c
index 8b108ac80b55..2731ce02ce53 100644
--- a/drivers/gpu/drm/panel/panel-novatek-nt35950.c
+++ b/drivers/gpu/drm/panel/panel-novatek-nt35950.c
@@ -571,8 +571,8 @@ static int nt35950_probe(struct mipi_dsi_device *dsi)
 		}
 
 		nt->dsi[1] = mipi_dsi_device_register_full(dsi_r_host, info);
-		if (!nt->dsi[1]) {
-			dev_err(dev, "Cannot get secondary DSI node\n");
+		if (IS_ERR(nt->dsi[1])) {
+			dev_err_probe(dev, PTR_ERR(nt->dsi[1]), "Cannot get secondary DSI node\n");
 			return -ENODEV;
 		}
 		num_dsis++;
-- 
2.25.1