btrfs: remove duplicated code to drop delayed ref during transaction …

…abort

When destroying delayed refs during a transaction abort, we have open
coded the removal of a delayed ref, which is also done by the static
helper function drop_delayed_ref(). So remove that duplicated code and
use drop_delayed_ref() instead.

Reviewed-by: Boris Burkov <boris@bur.io>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/delayed-ref.c

@@ -1261,13 +1261,7 @@ void btrfs_destroy_delayed_refs(struct btrfs_transaction *trans)
 			struct btrfs_delayed_ref_node *ref;
 
 			ref = rb_entry(n, struct btrfs_delayed_ref_node, ref_node);
-			rb_erase_cached(&ref->ref_node, &head->ref_tree);
-			RB_CLEAR_NODE(&ref->ref_node);
-			if (!list_empty(&ref->add_list))
-				list_del(&ref->add_list);
-			atomic_dec(&delayed_refs->num_entries);
-			btrfs_put_delayed_ref(ref);
-			btrfs_delayed_refs_rsv_release(fs_info, 1, 0);
+			drop_delayed_ref(fs_info, delayed_refs, head, ref);
 		}
 		if (head->must_insert_reserved)
 			pin_bytes = true;