ASoC: qcom: Fix NULL Dereference in asoc_qcom_lpass_cpu_platform_probe()

A devm_kzalloc() in asoc_qcom_lpass_cpu_platform_probe() could
possibly return NULL pointer. NULL Pointer Dereference may be
triggerred without addtional check.
Add a NULL check for the returned pointer.

Fixes: b5022a3 ("ASoC: qcom: lpass: Use regmap_field for i2sctl and dmactl registers")
Cc: [email protected]
Signed-off-by: Zichen Xie <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: Gax-c

sound/soc/qcom/lpass-cpu.c

@@ -1242,6 +1242,8 @@ int asoc_qcom_lpass_cpu_platform_probe(struct platform_device *pdev)
 	/* Allocation for i2sctl regmap fields */
 	drvdata->i2sctl = devm_kzalloc(&pdev->dev, sizeof(struct lpaif_i2sctl),
 					GFP_KERNEL);
+	if (!drvdata->i2sctl)
+		return -ENOMEM;
 
 	/* Initialize bitfields for dai I2SCTL register */
 	ret = lpass_cpu_init_i2sctl_bitfields(dev, drvdata->i2sctl,