Merge branch 'jk/drop-unused-parameters'

Drop unused parameters from functions. * jk/drop-unused-parameters: diff-lib: drop unused index argument from get_stat_data() ref-filter: drop unused parameters from email_atom_option_parser() pack-bitmap: drop unused parameters from select_pseudo_merges() pack-bitmap: load writer config from repository parameter refs: drop some unused parameters from create_symref_lock()