ASoC: mxs-saif: Avoid unnecessary check

The function mxs_saif_probe() is only called with an
openfirmware platform device. Therefore there is no
need to check that it has an openfirmware node.
Signed-off-by: NShengju Zhang <zhangshengju@cmss.chinamobile.com>
Signed-off-by: NTang Bin <tangbin@cmss.chinamobile.com>
Link: https://lore.kernel.org/r/20200420142509.9728-1-tangbin@cmss.chinamobile.comSigned-off-by: NMark Brown <broonie@kernel.org>

sound/soc/mxs/mxs-saif.c

@@ -736,9 +736,6 @@ static int mxs_saif_probe(struct platform_device *pdev)
 	int irq, ret = 0;
 	struct device_node *master;
 
-	if (!np)
-		return -EINVAL;
-
 	saif = devm_kzalloc(&pdev->dev, sizeof(*saif), GFP_KERNEL);
 	if (!saif)
 		return -ENOMEM;