media: tegra-cec: fix cec_notifier_parse_hdmi_phandle return check

cec_notifier_parse_hdmi_phandle returns an error pointer, not a NULL
pointer on error.

Fixes: 4d34c926: ("media: tegra_cec: use new cec_notifier_parse_hdmi_phandle helper")
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/platform/tegra-cec/tegra_cec.c

@@ -334,8 +334,8 @@ static int tegra_cec_probe(struct platform_device *pdev)
 
 	hdmi_dev = cec_notifier_parse_hdmi_phandle(&pdev->dev);
 
-	if (!hdmi_dev)
-		return -ENODEV;
+	if (IS_ERR(hdmi_dev))
+		return PTR_ERR(hdmi_dev);
 
 	cec = devm_kzalloc(&pdev->dev, sizeof(struct tegra_cec), GFP_KERNEL);