David Phillips authored Sep 19, 2018 and Allan McRae committed Sep 19, 2018

Currently, if checking the validity of packages fails due to an access
error on one or more packages, the user must sift through debug output
in order to find the culprit package(s). This patch adds a call to
_alpm_log in such a case to make the culprits more easily visible.

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