driver: Use dev_err_probe for mipi_dsi_attach failure

And rearrange the flow a bit to save one more line by returning directly
from dev_err_probe.

Author: z3ntu

driver.py

@@ -464,9 +464,8 @@ def generate_probe(p: Panel, options: Options) -> str:
 	s += '''
 	ret = mipi_dsi_attach(dsi);
 	if (ret < 0) {
-		dev_err(dev, "Failed to attach to DSI host: %d\\n", ret);
 		drm_panel_remove(&ctx->panel);
-		return ret;
+		return dev_err_probe(dev, ret, "Failed to attach to DSI host\\n");
 	}
 '''