[PATCH] drm/panel: ili9341: fix optional regulator handling

[Daniel Mack]

If the optional regulator lookup fails, reset the pointer to NULL.
Other functions such as mipi_dbi_poweron_reset_conditional() only do
a NULL pointer check and will otherwise dereference the error pointer.

Fixes: 5a04227326b04c15 ("drm/panel: Add ilitek ili9341 panel driver")
Signed-off-by: Daniel Mack <daniel at zonque.org>
---
 drivers/gpu/drm/panel/panel-ilitek-ili9341.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9341.c b/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
index 2c3378a259b1..e1542451ef9d 100644
--- a/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
@@ -612,8 +612,10 @@ static int ili9341_dbi_probe(struct spi_device *spi, struct gpio_desc *dc,
 	int ret;
 
 	vcc = devm_regulator_get_optional(dev, "vcc");
-	if (IS_ERR(vcc))
+	if (IS_ERR(vcc)) {
 		dev_err(dev, "get optional vcc failed\n");
+		vcc = NULL;
+	}
 
 	dbidev = devm_drm_dev_alloc(dev, &ili9341_dbi_driver,
 				    struct mipi_dbi_dev, drm);
-- 
2.35.1