fingerprint: check return status of hwbinder calls

If system_server dies, and return codes of hwbinder calls are not
checked, an abort of the HAL service will occur.  In this case,
warn in the logs, but allow system_server to reopen HAL.

Bug: 34867134
Change-Id: I9fe1c2c0f1c03e8debafb56bff8a7490ccbbcec0