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tpm2: Only access variable if unmarshalling worked

Only access the variable 'nvi' when the previous unmarshalling worked.
Before this change the undefined value of nvi would have been written
to memory but the error code from the failed marshalling propagated to
the caller so that it was working correctly before as well.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>

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