ASoC: ux500: Strengthen error checking after memory allocation

Currently there is no out-of-memory error checking after attempting
to allocate memory for the ux500_msp or ux500_msp_i2s_drvdata data
structures. Instead we go about populating them regardless. This
patch applies the necessary error checking to prevent a panic.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/ux500/ux500_msp_dai.c

@@ -760,6 +760,9 @@ static int __devinit ux500_msp_drv_probe(struct platform_device *pdev)
 	drvdata = devm_kzalloc(&pdev->dev,
 				sizeof(struct ux500_msp_i2s_drvdata),
 				GFP_KERNEL);
+	if (!drvdata)
+		return -ENOMEM;
+
 	drvdata->fmt = 0;
 	drvdata->slots = 1;
 	drvdata->tx_mask = 0x01;

sound/soc/ux500/ux500_msp_i2s.c

@@ -673,6 +673,8 @@ int ux500_msp_i2s_init_msp(struct platform_device *pdev,
 
 	*msp_p = devm_kzalloc(&pdev->dev, sizeof(struct ux500_msp), GFP_KERNEL);
 	msp = *msp_p;
+	if (!msp)
+		return -ENOMEM;
 
 	msp->id = platform_data->id;
 	msp->dev = &pdev->dev;