ASoC: imx-audmix: Add NULL check in imx_audmix_probe

devm_kasprintf() can return a NULL pointer on failure,but this
returned value in imx_audmix_probe() is not checked.
Add NULL check in imx_audmix_probe(), to handle kernel NULL
pointer dereference error.

Fixes: 05d996e113 ("ASoC: imx-audmix: Split capture device for audmix")
Signed-off-by: Charles Han <hanchunchao@inspur.com>
Link: https://patch.msgid.link/20241118084553.4195-1-hanchunchao@inspur.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/fsl/imx-audmix.c

@@ -274,6 +274,9 @@ static int imx_audmix_probe(struct platform_device *pdev)
 		/* Add AUDMIX Backend */
 		be_name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
 					 "audmix-%d", i);
+		if (!be_name)
+			return -ENOMEM;
+
 		priv->dai[num_dai + i].cpus	= &dlc[1];
 		priv->dai[num_dai + i].codecs	= &snd_soc_dummy_dlc;