FAPI: Fix missing check of return code in Fapi_ChangeAuth.
FAPI: Fix missing check of return code in Fapi_ChangeAuth.

The return code was not checked if the Entity does not exist.

Signed-off-by: Juergen Repp <03d74050f14a4f4ffcef98e77db067d01b35ed27@sit.fraunhofer.de>

01org/TPM2.0-TSS,tpm2-software/tpm2-tss,01org/tpm2-tss,01org/tpm2-tss,01org/TPM2.0-TSS,tpm2-software/tpm2-tss,01org/TPM2.0-TSS,tpm2-software/tpm2-tss,01org/TPM2.0-TSS,01org/tpm2-tss