zink: fix vertex buffer mask computation for null buffers
off by N
affects: KHR-GL46.texture_cube_map_array.sampling
Fixes: 53aade0e ("zink: fix enabled vertex buffer mask calculation")
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off by N
affects: KHR-GL46.texture_cube_map_array.sampling
Fixes: 53aade0e ("zink: fix enabled vertex buffer mask calculation")