Fix sparse build warning:
block/bio-integrity.c:27:6: warning:
 symbol '__bio_integrity_free' was not declared. Should it be static?
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
        flush_workqueue(kintegrityd_wq);
 }
 
-void __bio_integrity_free(struct bio_set *bs, struct bio_integrity_payload *bip)
+static void __bio_integrity_free(struct bio_set *bs,
+                                struct bio_integrity_payload *bip)
 {
        if (bs && mempool_initialized(&bs->bio_integrity_pool)) {
                if (bip->bip_vec)