ASoC: davinci - Fix possible NULL derefrence.

of_match_device could return NULL, and so can cause a NULL
pointer dereference later.
Signed-off-by: Shailendra Verma <shailendra.v@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/davinci/davinci-evm.c

@@ -358,13 +358,20 @@ static struct snd_soc_card evm_soc_card = {
 static int davinci_evm_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
-	const struct of_device_id *match =
-		of_match_device(of_match_ptr(davinci_evm_dt_ids), &pdev->dev);
-	struct snd_soc_dai_link *dai = (struct snd_soc_dai_link *) match->data;
+	const struct of_device_id *match;
+	struct snd_soc_dai_link *dai;
 	struct snd_soc_card_drvdata_davinci *drvdata = NULL;
 	struct clk *mclk;
 	int ret = 0;
 
+	match = of_match_device(of_match_ptr(davinci_evm_dt_ids), &pdev->dev);
+	if (!match) {
+		dev_err(&pdev->dev, "Error: No device match found\n");
+		return -ENODEV;
+	}
+
+	dai = (struct snd_soc_dai_link *) match->data;
+
 	evm_soc_card.dai_link = dai;
 
 	dai->codec_of_node = of_parse_phandle(np, "ti,audio-codec", 0);