Revert "Add signed integer overflow checking to flac."

This reverts commit ab37b6247df0e8c4ec0ccaa870e667f62c74975b.

Bug: 11458679
Change-Id: I57124c0a029040eb2f870918b1e7e3e4dd78d514
Merge pull request #1 from omnirom/android-4.4

Revert "Add signed integer overflow checking to flac."