libalpm: set ret in download files

download_files never set ret on failiure, so even when downloading
fails, the transaction goes on to commit and error out.

:: Retrieving packages...
 python-packaging-20.4-4-any.pkg.tar.zst failed to download
error: failed retrieving file 'python-packaging-20.4-4-any.pkg.tar.zst' from mirror.oldsql.cc : The requested URL returned error: 404
warning: failed to retrieve some files
(1/1) checking keys in keyring
(1/1) checking package integrity
error: failed to commit transaction (wrong or NULL argument passed)
Errors occurred, no packages were upgraded.

Also make the ret checking more consistent.

Signed-off-by: Allan McRae <allan@archlinux.org>

0 files changed, 0 insertions, 0 deletions