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rpc: Fix serialization of NULL mechanism pointer

A NULL mechanism pointer is valid for C_*Init functions to cancel the
operation.  Since 852ccd8d we encoded it with a CK_MECHANISM_TYPE 0 as
an indicator, though it clashes with CKM_RSA_PKCS_KEY_PAIR_GEN (0).
This patch changes the encoding to use a special value (0xffffffff) to
indicate that and also properly advance the offset when reading.

Signed-off-by: Daiki Ueno <ueno@gnu.org>

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