binder-test: Fix misuse of shared_ptr<PortAcl>

A pointer to a stack variable was passed to shared_ptr,
which would cause the smart pointer to attempt to call
delete on that pointer on program termination.

Bug: 272182788
Test: com.android.trusty.binder.test
Change-Id: Ied08295f50ce4582d20daf027c52148bff477f49
1 file changed