Avoid unfinished MockitoSession if setUp has errors

If there is an exception before initializing mInputChannel,
the tearDown will meet NPE. Then finishMocking and
clearInlineMocks are skipped which will affect the next test.

Bug: 313490373
Test: SystemServicesTestRuleTest
Change-Id: I846a209d9cbdd1ccd18e05fa4e053e16218d3c82
1 file changed