GENIO: panel: startek-kd070fhfid015: remove panel if mipi_dsi_attach fails

The problem is the panel driver got -EPROBE_DEFER from dsi host which
is not ready yet, but after defer probing the second time, finding the
matching panel while attaching to the host is causing de-referencing
error due to the un-removed panel of the previous one.

Therefore remove the panel if mipi_dsi_attach fails.

Change-Id: I3c3325853cacce889cfbdc1e8fcb43627072d931
Signed-off-by: Tommy Chen <tommyyl.chen@mediatek.com>

drivers/gpu/drm/panel/panel-startek-kd070fhfid015.c

@@ -445,7 +445,14 @@ static int stk_panel_probe(struct mipi_dsi_device *dsi)
 	if (ret < 0)
 		return ret;
 
-	return mipi_dsi_attach(dsi);
+	ret = mipi_dsi_attach(dsi);
+	if (ret < 0) {
+		drm_panel_remove(&stk->base);
+		dev_err(&dsi->dev, "mipi_dsi_attach() failed: %d\n", ret);
+		return -EPROBE_DEFER;
+	}
+
+	return ret;
 }
 
 static int stk_panel_remove(struct mipi_dsi_device *dsi)