marshal: Unmarshal selector to properly calculate offset
marshal: Unmarshal selector to properly calculate offset

Mhen unmarshalling TPMT type with a TPMU member, in case the dest is null
the selector needs to be unmarshalled into a tmp object to properly
calculate and update the offset.

Signed-off-by: Tadeusz Struk <ac7da5bc34fbda078ba4af5ef710d2a59a2316f5@intel.com>

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