- Use I_RpcGetBuffer, instead of our own buffer routines to fix an

- Use I_RpcGetBuffer, instead of our own buffer routines to fix an
  occasional test crash caused by heap corruption.
- Zero the memory block passed to RpcServerRegisterIfEx so we don't
  pass garbage in some of the fields we don't fill in.
- Return the correct error code from create_server and fix two handle
  leaks.
- TODO update.