Merge branch 'jk/unused-annotation'

Annotate function parameters that are not used (but cannot be
removed for structural reasons), to prepare us to later compile
with -Wunused warning turned on.

* jk/unused-annotation:
  is_path_owned_by_current_uid(): mark "report" parameter as unused
  run-command: mark unused async callback parameters
  mark unused read_tree_recursive() callback parameters
  hashmap: mark unused callback parameters
  config: mark unused callback parameters
  streaming: mark unused virtual method parameters
  transport: mark bundle transport_options as unused
  refs: mark unused virtual method parameters
  refs: mark unused reflog callback parameters
  refs: mark unused each_ref_fn parameters
  git-compat-util: add UNUSED macro

pretty.c

@@ -43,7 +43,8 @@ static void save_user_format(struct rev_info *rev, const char *cp, int is_tforma
 	rev->commit_format = CMIT_FMT_USERFORMAT;
 }
 
-static int git_pretty_formats_config(const char *var, const char *value, void *cb)
+static int git_pretty_formats_config(const char *var, const char *value,
+				     void *UNUSED(cb))
 {
 	struct cmt_fmt_map *commit_format = NULL;
 	const char *name;