btrfs: drop unused extent_op arg from btrfs_add_delayed_data_ref

btrfs_add_delayed_data_ref is always called with a NULL extent_op,
so let's drop the argument.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>