gallium/util: do not perform n^2 stencil blits
We already loop n times here, no point in doing n instances as well.
Fixes: e8a40715 ("gallium/util: add blitter-support for stencil-fallback")
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We already loop n times here, no point in doing n instances as well.
Fixes: e8a40715 ("gallium/util: add blitter-support for stencil-fallback")