[scudo] simplify flag parser out of bounds logic (#72371)

almost NFC, just that now we accept INT_MIN and INT_MAX

as discussed in https://r.android.com/2831100, but I didn't add the
*ValueEnd != Value check because I want to keep this change
behaviour-keeping.

GitOrigin-RevId: fd8e854a86d86c62064951ea8e34d1ea50ea1b56
Change-Id: I241fe6e665ceef005f5e8793be2e43cf35214633
1 file changed