vringh: use bvec_set_page to initialize a bvec

Use the bvec_set_page helper to initialize a bvec.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20230203150634.3199647-23-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

drivers/vhost/vringh.c

@@ -1126,9 +1126,8 @@ static int iotlb_translate(const struct vringh *vrh,
 		size = map->size - addr + map->start;
 		pa = map->addr + addr - map->start;
 		pfn = pa >> PAGE_SHIFT;
-		iov[ret].bv_page = pfn_to_page(pfn);
-		iov[ret].bv_len = min(len - s, size);
-		iov[ret].bv_offset = pa & (PAGE_SIZE - 1);
+		bvec_set_page(&iov[ret], pfn_to_page(pfn), min(len - s, size),
+			      pa & (PAGE_SIZE - 1));
 		s += size;
 		addr += size;
 		++ret;