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In "add front-end provided context to callbacks", libalpm gained a new argument to callbacks which we don't use and is only needed by some frontends wishing to do stuff with the callback state. NULL it and move on with life, just like pacman itself did. Signed-off-by: Eli Schwartz <eschwartz@archlinux.org> Signed-off-by: Daniel M. Capella <polyzen@archlinux.org>