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.de


Signed-off-by: Jens Axboe <axboe@kernel.dk>