fsck: mark unused parameters in various fsck callbacks

There are a few callback functions which are used with the fsck code,
but it's natural that not all callbacks need all parameters. For
reporting, even something as obvious as "the oid of the object which had
a problem" is not always used, as some callers are only checking a
single object in the first place. And for both reporting and walking,
things like void data pointers and the fsck_options aren't always
necessary.

But since each such parameter is used by _some_ callback, we have to
keep them in the interface. Mark the unused ones in specific callbacks
to avoid triggering -Wunused-parameter.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/unpack-objects.c

@@ -214,7 +214,8 @@ static void write_cached_object(struct object *obj, struct obj_buffer *obj_buf)
  * Verify its reachability and validity recursively and write it out.
  */
 static int check_object(struct object *obj, enum object_type type,
-			void *data, struct fsck_options *options)
+			void *data UNUSED,
+			struct fsck_options *options UNUSED)
 {
 	struct obj_buffer *obj_buf;