block: fix comment to use set_current_state

The explanatory comment used `set_task_state` instead of
`set_current_state` which is the function actually used in the code.

Signed-off-by: Alvaro Parker <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: AlvaroParker

block/blk-rq-qos.c

@@ -263,7 +263,7 @@ void rq_qos_wait(struct rq_wait *rqw, void *private_data,
 	has_sleeper = !prepare_to_wait_exclusive(&rqw->wait, &data.wq,
 						 TASK_UNINTERRUPTIBLE);
 	do {
-		/* The memory barrier in set_task_state saves us here. */
+		/* The memory barrier in set_current_state saves us here. */
 		if (data.got_token)
 			break;
 		if (!has_sleeper && acquire_inflight_cb(rqw, private_data)) {