[PATCH] alpm: return -1 for error in find_dl_candidates

[Andrew Gregory]

On 10/04/21 at 08:09pm, morganamilo wrote:
> This is the error value generally used and the calling function
> explicitly checks for -1, later causing the error to be missed
> and the transaction to continue.

This result is not compared to -1, the result of download_files is.  If we want
to guarantee that download_files will return -1 on error, that's where the
return should be normalized, not in find_dl_candidates.  Tying the API of one
function to another like this is just going to cause confusion and breakage
when somebody forgets in the future.  Really, the caller of download_files
should just check for a successful return; we return 1 as an error from lots of
functions.