A small handful of minor changes to the sliced texture transfer code and related functions

Nothing substantial to see here, I was originally planning on rewriting the sliced texture code to also handle misaligned formats, but this turns out to be a lot trickier to get right than I thought, and I'd rather avoid breaking everything right now.

approved this merge request

added 7 commits

• 4b2388bb - 1 commit from branch videolan:master
• 3bd1c970 - gpu/utils: add more sanity verifications
• 1633311a - gpu/utils: use correct limit for tex transfer slices
• cded3651 - gpu/utils: allow non-texel emulated format slices
• d392fdea - gpu/utils: remove error path from pl_tex_transfer_slices
• b0d5a82b - vulkan/gpu_tex: slight improvement to sanity assertions
• adc9d7fc - vulkan/gpu_tex: properly propagate tex transfer return value

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enabled an automatic merge when the pipeline for adc9d7fc succeeds

merged