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Fix RPC calls: ATTRIBUTE buf not null but length 0

Let's add a support for cases when the buffer != NULL but the
length is 0. According to Oasis, buffer = NULL and length = 0
means a query of the length so the subsequent calls with a
buffer != NULL should fill then buffer when length is long enough.
If not, according to Oasis, one should get a CKR_BUFFER_TOO_SMALL.

See the previous commit for IN_ULONG_BUFFER(). This patch is
follow a similar design pattern.

Fix: issue #257

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