i965: Stop passing num_samples to intel_miptree_alloc_hiz().

The number of samples is already available in the miptree data
structure, so there's no need to pass it in.

I suspect this may fix a subtle bug because in one case
(intel_renderbuffer_update_wrapper) we were always passing zero for
num_samples, even though the buffer in question was not guaranteed to
be single-sampled.  But I wasn't able to find a failing test case.

Reviewed-by: Eric Anholt <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

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