ASoC: qcom: Fix NULL Dereference in asoc_qcom_lpass_cpu_platform_probe()

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: b5022a36d28f ("ASoC: qcom: lpass: Use regmap_field for i2sctl and dmactl registers")
Cc: stable@vger.kernel.org
Signed-off-by: Zichen Xie <zichenxie0106@gmail.com>
Link: https://patch.msgid.link/20241006205737.8829-1-zichenxie0106@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>