Merge branch 'jk/unused-anno-more'

More UNUSED annotation to help using -Wunused option with the
compiler.

* jk/unused-anno-more:
  ll-merge: mark unused parameters in callbacks
  diffcore-pickaxe: mark unused parameters in pickaxe functions
  convert: mark unused parameter in null stream filter
  apply: mark unused parameters in noop error/warning routine
  apply: mark unused parameters in handlers
  date: mark unused parameters in handler functions
  string-list: mark unused callback parameters
  object-file: mark unused parameters in hash_unknown functions
  mark unused parameters in trivial compat functions
  update-index: drop unused argc from do_reupdate()
  submodule--helper: drop unused argc from module_list_compute()
  diffstat_consume(): assert non-zero length

builtin/remote.c

@@ -942,7 +942,7 @@ static int rm(int argc, const char **argv, const char *prefix)
 	return result;
 }
 
-static void clear_push_info(void *util, const char *string)
+static void clear_push_info(void *util, const char *string UNUSED)
 {
 	struct push_info *info = util;
 	free(info->dest);