cpufreq: qcom-nvmem: add sentinel to qcom_cpufreq_ipq806x_match_list

The of_device_id table is expected to be NULL-terminated. Without the
sentinel, the traversal of the array can lead to out-of-bound access,
causing undefined behavior.

This adds the missing sentinel to the qcom_cpufreq_ipq806x_match_list
array.

Fixes: 58f5d39d5ed8 ("cpufreq: qcom-nvmem: add compatible fallback for ipq806x for no SMEM")
Signed-off-by: Pei Xiao <[e-mail]>
Reviewed-by: Konrad Dybcio <[e-mail]>
Signed-off-by: Viresh Kumar <[e-mail]>

drivers/cpufreq/qcom-cpufreq-nvmem.c

···
 	{ .compatible = "qcom,ipq8066", .data = (const void *)QCOM_ID_IPQ8066 },
 	{ .compatible = "qcom,ipq8068", .data = (const void *)QCOM_ID_IPQ8068 },
 	{ .compatible = "qcom,ipq8069", .data = (const void *)QCOM_ID_IPQ8069 },
+	{ /* sentinel */ }
 };
 
 static int qcom_cpufreq_ipq8064_name_version(struct device *cpu_dev,