Return error when test initialization fails

[ Merge of http://go/wvgerrit/116243 ]

Currently if a command line argument is not understood, all tests are
skipped and the test suite passes.

Bug: 182058081
Test: WV unit/integration tests
Change-Id: I9725a9ed9446f15f08372e68c7a25dffd99c7cef

libwvdrmengine/cdm/core/test/test_main.cpp

@@ -11,7 +11,7 @@
 #include "test_base.h"
 
 int main(int argc, char** argv) {
-  if (!wvcdm::WvCdmTestBase::Initialize(argc, argv)) return 0;
+  if (!wvcdm::WvCdmTestBase::Initialize(argc, argv)) return 1;
   ::testing::InitGoogleTest(&argc, argv);
   return RUN_ALL_TESTS();
 }