When per-primitive padding is needed, max_push_buffers is set to 3
(instead of 4) to reserve the last slot for it.
The assert was requiring `n_push_ranges < max_push_buffers`, which
incorrectly fired when the 3 ranges were used.
Fixes: a8ba682919 ("anv: assert we haven't gone over the maximum number of push_buffers")
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/work_items/15155
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Dylan Baker <dylan.c.baker@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/40803>
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