drm/tilcdc: Fix hardcoded fail-return value in tilcdc_crtc_create()

Fix badly hardcoded return return value under fail-label. All goto
branches to the label set the "ret"-variable accordingly.
Signed-off-by: Jyri Sarha <jsarha@ti.com>
Reviewed-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk>

drivers/gpu/drm/tilcdc/tilcdc_crtc.c

@@ -1036,5 +1036,5 @@ int tilcdc_crtc_create(struct drm_device *dev)
 
 fail:
 	tilcdc_crtc_destroy(crtc);
-	return -ENOMEM;
+	return ret;
 }