drm: logicvc: fix error code in logicvc_layer_init()

Return -EINVAL if logicvc_layer_formats_lookup() fails.  Don't return
success.

Fixes: efeeaefe ("drm: Add support for the LogiCVC display controller")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/Yqh6VdNiDvJYMOQ+@kili

drivers/gpu/drm/logicvc/logicvc_layer.c

@@ -491,6 +491,7 @@ static int logicvc_layer_init(struct logicvc_drm *logicvc,
 	if (!formats) {
 		drm_err(drm_dev, "Failed to lookup formats for layer #%d\n",
 			index);
+		ret = -EINVAL;
 		goto error;
 	}