Deleted unused method git_cached_object_match, since we do not explore the cache…

Deleted unused method git_cached_object_match, since we do not explore the cache when searching objects from a short oid.

src/cache.h

@@ -42,11 +42,6 @@ GIT_INLINE(int) git_cached_obj_compare(git_cached_obj *obj, const git_oid *oid)
 	return git_oid_cmp(&obj->oid, oid);
 }
 
-GIT_INLINE(int) git_cached_obj_match(unsigned int len, git_cached_obj *obj, const git_oid *oid)
-{
-	return git_oid_match(len, &obj->oid, oid);
-}
-
 GIT_INLINE(void) git_cached_obj_incref(git_cached_obj *obj)
 {
 	git_atomic_inc(&obj->refcount);