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tpm2: Initialize variable reported by Coverity (false positive)

Initialize a variable in TPM2_PolicyAuthorizeNV() following Coverity
report CID 1470811.

Down the callpath as reported in CID 1470811 in TPMI_ALG_HASH_Unmarshal()
the passed-in value of TPMI_ALG_HASH *target is stored and possibly
restored later on in case of failure. Coverity complains that the variable
is uninitialized. While this is correct, there's no harm reading the
uninitialized value from the structure and possibly restoring it later
on while not doing anything else with it otherwise. Therefore, it's a
false positive.

Resolves: https://github.com/stefanberger/libtpms/issues/311
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>

1 of 1 new or added line in 1 file covered. (100.0%)

29212 of 37712 relevant lines covered (77.46%)

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