[PATCH 0/4] merge-ort unused parameter cleanups

A few small cleanups for merge-ort collected from playing with -Wunused-parameter. The first one actually fixes a user-visible bug, and the rest are just cleanups.

  [1/4]: merge-ort: drop custom err() function
  [2/4]: merge-ort: stop passing "opt" to read_oid_strbuf()
  [3/4]: merge-ort: drop unused parameters from detect_and_process_renames()
  [4/4]: merge-ort: drop unused "opt" parameter from merge_check_renames_reusable()

 merge-ort.c           | 48 +++++++++++--------------------------------
 t/t6406-merge-attr.sh |  3 ++-
 2 files changed, 14 insertions(+), 37 deletions(-)

-Peff