libbinder: Status - fix read at end of Parcel

Due to OBO (actually off by 4), a Status at the end of the Parcel
with exception information would be reduced to EX_TRANSACTION_FAILED
in native code.

Bug: 235006086
Bug: 132650049
Test: connectivity_native_test, binder_parcel_fuzzer (for a few minutes), aidl_integration_test
Change-Id: I5660958006d7670ad6fc3aabde725cd1d8fe188a