c3de636 coreos-release-note: fix error produced when calculating pkgdiffs

Authored and Committed by abai 3 years ago
    coreos-release-note: fix error produced when calculating pkgdiffs
    
    This error was not found previously since the conditional block was
    not hit when calculating pkgdiffs. Essentially the accumulated pkgdiff
    is an array of arrays, and the previous code lacks a layer of indexing
    to modify the individual pkgdiff info.
    
    In the future, more error checkings need to be added to handle this kind
    of situations more gracefully.
    
    Signed-off-by: Allen Bai <abai@redhat.com>