Fix mismatched status types
Fix mismatched status types

Fixes this issue:
https://github.com/SwiftGit2/SwiftGit2/issues/119

Uses the libgit2 values to ensure no future problems arise.

mattrubin/SwiftGit2,SwiftGit2/SwiftGit2,SwiftGit2/SwiftGit2,mattrubin/SwiftGit2