INI: Allow longer values then PATH_MAX
    
    The older API used fgets to read the values and the
    size of buffer to hold the line was fixed. With the
    new API we use getline to get the whole line and this
    does not require pre-allocated buffer. The check
    for lenght was not necessary here.
    
    Resolves:
    https://pagure.io/SSSD/ding-libs/issue/3177
    
    Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
    
    Merges: https://pagure.io/SSSD/ding-libs/pull-request/3178