This fixes a copy and paste error introduced by 9f060e22
("block: Convert integrity to bvec_alloc_bs()").

Found by Coverity (CID 1020654).
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NKent Overstreet <koverstreet@google.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>