block: Fix typo 'prefered' -> 'preferred'

Fix spelling mistake.

No functional change.

Signed-off-by: Ignacio Pena <[email protected]>

Author: ipenas-cl

block/blk-mq.c

@@ -2361,7 +2361,7 @@ void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async)
 EXPORT_SYMBOL(blk_mq_run_hw_queue);
 
 /*
- * Return prefered queue to dispatch from (if any) for non-mq aware IO
+ * Return preferred queue to dispatch from (if any) for non-mq aware IO
  * scheduler.
  */
 static struct blk_mq_hw_ctx *blk_mq_get_sq_hctx(struct request_queue *q)