cryptsetup: use unabbrieviated variable names
    
    Now that "ret_" has been added to the output variables, we can name
    the internal variables without artificial abbrevs.
    
    (cherry picked from commit 5d2100dc4c32abbce4109e75cbfbbef6e1b2b7b1)
    
    Related: #1763155
    
    patch_name: 0299-cryptsetup-use-unabbrieviated-variable-names.patch
    present_in_specfile: true
    location_in_specfile: 299
    squash_commits: true