Merge branch 'jk/unused-fixes'

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()