block: make function __bio_integrity_free() static

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>
diff --git a/block/bio-integrity.c b/block/bio-integrity.c
index 4707e90..9ffd7e2 100644
--- a/block/bio-integrity.c
+++ b/block/bio-integrity.c
@@ -24,7 +24,8 @@ void blk_flush_integrity(void)
 	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)