ASoC: imx-hdmi: remove useless null check before call of_node_put()

No need to add null check before call of_node_put(), since the
implementation of of_node_put() has done it.
Signed-off-by: Haowen Bai <baihaowen@meizu.com>
Link: https://lore.kernel.org/r/1650509120-25377-1-git-send-email-baihaowen@meizu.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/imx-hdmi.c

@@ -206,8 +206,7 @@ static int imx_hdmi_probe(struct platform_device *pdev)
 	}
 
 fail:
-	if (cpu_np)
-		of_node_put(cpu_np);
+	of_node_put(cpu_np);
 
 	return ret;
 }