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@anholt.net>')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
         * 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;