soc: fsl: guts: Add a NULL check for devm_kasprintf()

devm_kasprintf() may fail, so we should better add a NULL check
and propagate an error on failure.
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Acked-by: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: Li Yang <leoyang.li@nxp.com>

drivers/soc/fsl/guts.c

@@ -167,10 +167,16 @@ static int fsl_guts_probe(struct platform_device *pdev)
 	} else {
 		soc_dev_attr.family = devm_kasprintf(dev, GFP_KERNEL, "QorIQ");
 	}
+	if (!soc_dev_attr.family)
+		return -ENOMEM;
 	soc_dev_attr.soc_id = devm_kasprintf(dev, GFP_KERNEL,
 					     "svr:0x%08x", svr);
+	if (!soc_dev_attr.soc_id)
+		return -ENOMEM;
 	soc_dev_attr.revision = devm_kasprintf(dev, GFP_KERNEL, "%d.%d",
 					       (svr >>  4) & 0xf, svr & 0xf);
+	if (!soc_dev_attr.revision)
+		return -ENOMEM;
 
 	soc_dev = soc_device_register(&soc_dev_attr);
 	if (IS_ERR(soc_dev))