kdump-lib.sh: declare and assign separately
    
    upstream: fedora
    resolves: bz2003832
    conflict: none
    
    commit 20089dddd5b2dcf233483e3b5b8142f33e5ab7f1
    Author: Kairui Song <kasong@redhat.com>
    Date:   Wed Sep 8 03:48:19 2021 +0800
    
        kdump-lib.sh: declare and assign separately
    
        See: https://github.com/koalaman/shellcheck/wiki/SC2155
    
        Signed-off-by: Kairui Song <kasong@redhat.com>
    
    Signed-off-by: Tao Liu <ltao@redhat.com>