[scudo] Fix format string specifiers

Enable `-Wformat` again, and fix the offending instances.

Differential Revision: https://reviews.llvm.org/D108168

GitOrigin-RevId: 5009be2f09ae25654753ee533dbfbc238aaf591c
Change-Id: Icd55c53967be36c9df0350a17b21decf295e0223
4 files changed