ASoC: Intel: Atom: add terminate entry for dmi_system_id tables

Make sure dmi_system_id tables are NULL terminated.

Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/atom/sst/sst_acpi.c

@@ -343,6 +343,7 @@ static const struct dmi_system_id cht_table[] = {
 			DMI_MATCH(DMI_PRODUCT_NAME, "Surface 3"),
 		},
 	},
+	{ }
 };