llvmpipe: Fix build error with clang-18
What does this MR do and why?
llvmpipe: Fix build error with clang-18
We don't actually care about the truncation, so tell clang to stfu.
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/10973
Signed-off-by: Rob Clark <robdclark@chromium.org>
maybe this only happens when building from git, idk. But it is annoying. So tell clang to shut up