Added missing ASSERT_NE.

Test was failing with segmentation fault (and crashing whole VTS) when
device was not available.

Change-Id: Id0f28d061dc5858fa00ef1bac5f7aa467d860864
Merged-In: Id0f28d061dc5858fa00ef1bac5f7aa467d860864
(cherry picked from commit 70d25b813e26defdef6defee3f238e8065a89bb6)
diff --git a/neuralnetworks/1.2/vts/functional/CompilationCachingTests.cpp b/neuralnetworks/1.2/vts/functional/CompilationCachingTests.cpp
index 454aa1f..d715d24 100644
--- a/neuralnetworks/1.2/vts/functional/CompilationCachingTests.cpp
+++ b/neuralnetworks/1.2/vts/functional/CompilationCachingTests.cpp
@@ -86,6 +86,7 @@
   protected:
     void SetUp() override {
         NeuralnetworksHidlTest::SetUp();
+        ASSERT_NE(device.get(), nullptr);
 
         // Create cache directory.
         char cacheDirTemp[] = "/data/local/tmp/TestCompilationCachingXXXXXX";