audio: VtsHalAudioCoreModuleTargetTest: Convert a SIGSEGV into an assertion failure

Convert the following segmentation fault into an assertion failure:

 signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x0000000000000000
 Cause: null pointer dereference
 9 total frames
 backtrace:
       #00 pc 000000000020e532  /data/local/tmp/VtsHalAudioCoreTargetTest/x86_64/VtsHalAudioCoreTargetTest (AudioCoreModuleBase::TearDownImpl()+114) (BuildId: f1bb3c414cf012ccd7d268b4e0c7fefe)
       #01 pc 00000000001c890a  /data/local/tmp/VtsHalAudioCoreTargetTest/x86_64/VtsHalAudioCoreTargetTest (AudioCoreModule::TearDown()+106) (BuildId: f1bb3c414cf012ccd7d268b4e0c7fefe)
       #02 pc 00000000002b62a8  /data/local/tmp/VtsHalAudioCoreTargetTest/x86_64/VtsHalAudioCoreTargetTest (testing::TestInfo::Run()+424) (BuildId: f1bb3c414cf012ccd7d268b4e0c7fefe)
       #03 pc 00000000002b6de4  /data/local/tmp/VtsHalAudioCoreTargetTest/x86_64/VtsHalAudioCoreTargetTest (testing::TestSuite::Run()+804) (BuildId: f1bb3c414cf012ccd7d268b4e0c7fefe)
       #04 pc 00000000002c5c7e  /data/local/tmp/VtsHalAudioCoreTargetTest/x86_64/VtsHalAudioCoreTargetTest (testing::internal::UnitTestImpl::RunAllTests()+2622) (BuildId: f1bb3c414cf012ccd7d268b4e0c7fefe)
       #05 pc 00000000002c50cc  /data/local/tmp/VtsHalAudioCoreTargetTest/x86_64/VtsHalAudioCoreTargetTest (testing::UnitTest::Run()+140) (BuildId: f1bb3c414cf012ccd7d268b4e0c7fefe)
       #06 pc 00000000001c86f0  /data/local/tmp/VtsHalAudioCoreTargetTest/x86_64/VtsHalAudioCoreTargetTest (RUN_ALL_TESTS()+16) (BuildId: f1bb3c414cf012ccd7d268b4e0c7fefe)
       #07 pc 00000000001c8669  /data/local/tmp/VtsHalAudioCoreTargetTest/x86_64/VtsHalAudioCoreTargetTest (main+137) (BuildId: f1bb3c414cf012ccd7d268b4e0c7fefe)
       #08 pc 00000000000547e9  /apex/com.android.runtime/lib64/bionic/libc.so (__libc_init+89) (BuildId: e5ef3cc48c1e014ffb7dbbcfc7f9d475)

Bug: 308687042
Change-Id: I2d528dd9cf0f59bcd6b0e485b4f6141320d89a81
Signed-off-by: Bart Van Assche <bvanassche@google.com>