Assert getService does not return nullptr

Make sure getService return value is not null before running
testcase

Test: make vts -j40 && vts-tradefed run commandAndExit vts -m
VtsHalConfigstoreV1_0Target
Bug:62931371

Merged-In: I432e07c0c61a308b814d88cab9027a95ff24d8b5
(cherry picked from commit 60ff24c62e3215d24cdad0b7b29926734eb24c10)

Change-Id: Id9bb2a3fb2c4caf02c7e03c1529cefe2570c5453
diff --git a/configstore/1.0/vts/functional/VtsHalConfigstoreV1_0TargetTest.cpp b/configstore/1.0/vts/functional/VtsHalConfigstoreV1_0TargetTest.cpp
index 95cd30b..e501580 100644
--- a/configstore/1.0/vts/functional/VtsHalConfigstoreV1_0TargetTest.cpp
+++ b/configstore/1.0/vts/functional/VtsHalConfigstoreV1_0TargetTest.cpp
@@ -41,6 +41,7 @@
     virtual void SetUp() override {
         sfConfigs = ::testing::VtsHalHidlTargetTestBase::getService<
             ISurfaceFlingerConfigs>();
+        ASSERT_NE(sfConfigs, nullptr);
     }
 
     virtual void TearDown() override {}