block: fix bad lockdep annotation in blk-iolatency

A previous commit added a lockdep annotation, but botched it. Use the
right type.

Fixes: 4eb44d10 ("block: remove init_mutex and open-code blk_iolatency_try_init")
Signed-off-by: Jens Axboe <axboe@kernel.dk>

block/blk-iolatency.c

@@ -846,7 +846,7 @@ static ssize_t iolatency_set_limit(struct kernfs_open_file *of, char *buf,
 	 * blk_iolatency_init() may fail after rq_qos_add() succeeds which can
 	 * confuse iolat_rq_qos() test. Make the test and init atomic.
 	 */
-	lockdep_assert_held(ctx.bdev->bd_queue->rq_qos_mutex);
+	lockdep_assert_held(&ctx.bdev->bd_queue->rq_qos_mutex);
 	if (!iolat_rq_qos(ctx.bdev->bd_queue))
 		ret = blk_iolatency_init(ctx.bdev->bd_disk);
 	if (ret)