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tpm2: Fix compilation error in TPM2B_CREATION_DATA_Marshal (Fedora 32/s390x)

This patch fixes the following compilation error on Fedora 32 / s390x:

tpm2/Marshal.c: In function 'TPM2B_CREATION_DATA_Marshal':
tpm2/Marshal.c:95:19: error: 'sizePtr' may be used uninitialized in this function [-Werror=maybe-uninitialized]
   95 |      (*buffer)[0] = (BYTE)((*source >> 8) & 0xff);
      |      ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
tpm2/Marshal.c:2201:11: note: 'sizePtr' was declared here
 2201 |     BYTE *sizePtr;
      |           ^~~~~~~

The error is a false positive since sizePtr will have been initialized if
UINT16_Marshal() is called.

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

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