block: call bio_associate_blkg from bio_reset

Call bio_associate_blkg just like bio_set_dev did in the callers before
the conversion to set the block device in bio_reset.

Fixes: a7c50c94 ("block: pass a block_device and opf to bio_reset")
Reported-by: syzbot+2b3f18414c37b42dcc94@syzkaller.appspotmail.com
Tested-by: syzbot+2b3f18414c37b42dcc94@syzkaller.appspotmail.com
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Link: https://lore.kernel.org/r/20220204071934.168469-1-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/bio.c

@@ -310,6 +310,8 @@ void bio_reset(struct bio *bio, struct block_device *bdev, unsigned int opf)
 	memset(bio, 0, BIO_RESET_BYTES);
 	atomic_set(&bio->__bi_remaining, 1);
 	bio->bi_bdev = bdev;
+	if (bio->bi_bdev)
+		bio_associate_blkg(bio);
 	bio->bi_opf = opf;
 }
 EXPORT_SYMBOL(bio_reset);