[compiler-rt] [scudo] Fix realloc hooks behavior (PR #74149)

[Christopher Ferris via llvm-commits]

https://github.com/cferris1000 approved this pull request.

LGTM.

Since this is a real bug, it's better to have a single bugfix change rather than introducing something new and fixing the bug.

https://github.com/llvm/llvm-project/pull/74149