Merge branch 'jk/unused-fixes'

Code clean-up to remove unused function parameters. * jk/unused-fixes: xdiff: drop unused mmfile parameters from xdl_do_patience_diff() reflog: assert PARSE_OPT_NONEG in parse-options callbacks reftable: drop unused parameter from reader_seek_linear() verify_one_sparse(): drop unused parameters match_pathname(): drop unused "flags" parameter log-tree: drop unused commit param in remerge_diff() xdiff: drop unused mmfile parameters from xdl_do_histogram_diff()