downloader: Fix possible use of uninitialized variables
downloader: Fix possible use of uninitialized variables

Conan-Kudo/librepo,Tojaj/librepo,cgwalters/librepo,cgwalters/librepo,Tojaj/librepo,rholy/librepo,rpm-software-management/librepo,cgwalters/librepo,rholy/librepo,cgwalters/librepo,Conan-Kudo/librepo,bgamari/librepo,rpm-software-management/librepo,rholy/librepo,Tojaj/librepo,bgamari/librepo,Conan-Kudo/librepo,rholy/librepo,bgamari/librepo,rpm-software-management/librepo