Merge branch 'ab/unused-annotation'

Undoes 'jk/unused-annotation' topic and redoes it to work around
Coccinelle rules misfiring false positives in unrelated codepaths.

* ab/unused-annotation:
  git-compat-util.h: use "deprecated" for UNUSED variables
  git-compat-util.h: use "UNUSED", not "UNUSED(var)"

attr.c

@@ -61,10 +61,10 @@ struct attr_hash_entry {
 };
 
 /* attr_hashmap comparison function */
-static int attr_hash_entry_cmp(const void *UNUSED(cmp_data),
+static int attr_hash_entry_cmp(const void *cmp_data UNUSED,
 			       const struct hashmap_entry *eptr,
 			       const struct hashmap_entry *entry_or_key,
-			       const void *UNUSED(keydata))
+			       const void *keydata UNUSED)
 {
 	const struct attr_hash_entry *a, *b;