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It's useful to distinguish the failure to find updates. This carries over the ability for pacman -Qu to return errors when no upgrades are available. At the same time, this should (unlike pacman -Qu) use its own unique return code, since checkupdates may error for a couple of reasons including download issues. Fixes FS#64219 Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>