Christian Schlack

Invalid credentials result in infinite loop

2

``` credentials = Rugged::Credentials::UserPassword.new({ username: 'user', password: 'abcd' }) repository = Rugged::Repository.clone_at('https://github.com/libgit2/private_repository', 'repository_clone/', { credentials: credentials }) ``` results in an infinite loop. According to https://github.com/libgit2/libgit2/issues/3358 and https://libgit2.github.com/libgit2/#HEAD/group/callback/git_cred_acquire_cb `git_cred_acquire_cb()` is...