libexif: Avoid buffer overflow due to compiler optimization

Modify an arguments size check and decrease so that the
likelihood of the compiler removing it as part of
optimizations is low.
The arguments check must always be triggered to avoid
potential buffer overflows.

Bug: 159625731
Test: run sts-engbuild-no-spl-lock -m StsHostTestCases --test

Change-Id: I6f1b24a699c307b59e51dc0e22f4ed21f4b99feb
(cherry picked from commit 4c18b0fabf48fe4460b679805b0442d76a78bde7)
2 files changed