[fuzzer] Fix nested mallocs

Summary: Nested mallocs are possible with internal symbolizer.

Reviewers: kcc

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D39397

llvm-svn: 317186
GitOrigin-RevId: 7d22324b879003e1e4c3d25b8c3ae2d11eefea50
1 file changed