refs: mark unused parameters in ref_store fsck callbacks

Commit ab6f79d (refs: set up ref consistency check infrastructure,
2024-08-08) added virtual functions to the ref store for doing fsck
checks. But the packed and reftable backends do not yet do anything.

Let's annotate them to silence -Wunused-parameter.

Signed-off-by: Jeff King <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: peff

refs/packed-backend.c

@@ -1733,8 +1733,8 @@ static struct ref_iterator *packed_reflog_iterator_begin(struct ref_store *ref_s
 	return empty_ref_iterator_begin();
 }
 
-static int packed_fsck(struct ref_store *ref_store,
-		       struct fsck_options *o)
+static int packed_fsck(struct ref_store *ref_store UNUSED,
+		       struct fsck_options *o UNUSED)
 {
 	return 0;
 }

refs/reftable-backend.c

@@ -2309,8 +2309,8 @@ static int reftable_be_reflog_expire(struct ref_store *ref_store,
 	return ret;
 }
 
-static int reftable_be_fsck(struct ref_store *ref_store,
-			    struct fsck_options *o)
+static int reftable_be_fsck(struct ref_store *ref_store UNUSED,
+			    struct fsck_options *o UNUSED)
 {
 	return 0;
 }