[patch] drm/vc4: checking for NULL instead of IS_ERR

[Dan Carpenter]

vc4_plane_init() returns an ERR_PTR on error, it doesn't return NULL.
This was obviously intended because the next lines call
PTR_ERR(primary_plane) already.

Fixes: c8b75bca92cb ('Eric Anholt <eric at anholt.net>')
Signed-off-by: Dan Carpenter <dan.carpenter at oracle.com>

diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
index 7a9f476..0c363df 100644
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -591,14 +591,14 @@ static int vc4_crtc_bind(struct device *dev, struct 
device *master, void *data)
         * that will take too much.
         */
        primary_plane = vc4_plane_init(drm, DRM_PLANE_TYPE_PRIMARY);
-       if (!primary_plane) {
+       if (IS_ERR(primary_plane)) {
                dev_err(dev, "failed to construct primary plane\n");
                ret = PTR_ERR(primary_plane);
                goto err;
        }

        cursor_plane = vc4_plane_init(drm, DRM_PLANE_TYPE_CURSOR);
-       if (!cursor_plane) {
+       if (IS_ERR(cursor_plane)) {
                dev_err(dev, "failed to construct cursor plane\n");
                ret = PTR_ERR(cursor_plane);
                goto err_primary;