media: staging/imx: fix two NULL vs IS_ERR() bugs

The imx_media_pipeline_pad() function return NULL pointers on error, it
never returns error pointers.

Fixes: 3ef46bc9 ("media: staging/imx: Improve pipeline searching")
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NHans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: NMauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/staging/media/imx/imx-media-csi.c

@@ -193,8 +193,8 @@ static int csi_get_upstream_endpoint(struct csi_priv *priv,
 
 	/* get source pad of entity directly upstream from src */
 	pad = imx_media_pipeline_pad(src, 0, 0, true);
-	if (IS_ERR(pad))
-		return PTR_ERR(pad);
+	if (!pad)
+		return -ENODEV;
 
 	sd = media_entity_to_v4l2_subdev(pad->entity);
 

drivers/staging/media/imx/imx7-media-csi.c

@@ -439,8 +439,8 @@ static int imx7_csi_get_upstream_endpoint(struct imx7_csi *csi,
 skip_video_mux:
 	/* get source pad of entity directly upstream from src */
 	pad = imx_media_pipeline_pad(src, 0, 0, true);
-	if (IS_ERR(pad))
-		return PTR_ERR(pad);
+	if (!pad)
+		return -ENODEV;
 
 	sd = media_entity_to_v4l2_subdev(pad->entity);