Fix bug for failing to init Offload AIDL HAL service

When fail to init offload AIDL service, OFFLOAD_HAL_VERSION_NONE is
returned. Not as expected, it go to close the FDs for AIDL service and
causes a NE.

Bug: 277834236
Test: atest com.android.networkstack.tethering
Change-Id: I26a7412cb7d88f0d56b713db18af5cd9583a7942
1 file changed