fix compile warning when meson build

- Fix compile warning:
  [-Werror=unused-variable], [-Werror=sign-compare] and
  deprecated INSTANTIATE_TEST_CASE_P

Signed-off-by: Harvey.Wu <Harvey.Wu@quantatw.com>
Change-Id: If8713f0b938cd5306bbe19a9078731db0c3667dc
diff --git a/test/dbus_util_unittest.cpp b/test/dbus_util_unittest.cpp
index 2f20fd6..4896e03 100644
--- a/test/dbus_util_unittest.cpp
+++ b/test/dbus_util_unittest.cpp
@@ -32,7 +32,7 @@
                 StrEq(std::get<2>(params)));
 }
 
-INSTANTIATE_TEST_CASE_P(
+INSTANTIATE_TEST_SUITE_P(
     GetSensorPathTests, GetSensorPathTest,
     ::testing::Values(
         std::make_tuple("fan", "0", "/xyz/openbmc_project/sensors/fan_tach/0"),