-- Issue 2577 test commit --

I hope i do this request correctly.

https://github.com/libgit2/libgit2/issues/2577
I think that making `offset` a `size_t` or a `git_off_t` would be preferable here.  Realistically, it can't be negative, so I think a `size_t` would be reasonable.  This is a pretty minor nit, I realize.

Also, it looks like some whitespace has inadvertantly changed here when adding this.  Would you mind reformatting this to use hard tabs?