[NFC] Fix int-compared-with-unsigned warnings
This is a follow-up to 7d77bbef where I added some incompatible comparisons, this should clear: https://lab.llvm.org/buildbot/#/builders/57/builds/30951
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This is a follow-up to 7d77bbef where I added some incompatible comparisons, this should clear: https://lab.llvm.org/buildbot/#/builders/57/builds/30951
mentioned in commit 957efa4c