[BLOCK] Get rid of request_queue_t typedef

Some of the code has been gradually transitioned to using the proper
struct request_queue, but there's lots left. So do a full sweet of
the kernel and get rid of this typedef and replace its uses with
the proper type.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 424d557..e21c714 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -814,7 +814,7 @@
 	return ret;
 }
 
-static void sd_prepare_flush(request_queue_t *q, struct request *rq)
+static void sd_prepare_flush(struct request_queue *q, struct request *rq)
 {
 	memset(rq->cmd, 0, sizeof(rq->cmd));
 	rq->cmd_type = REQ_TYPE_BLOCK_PC;
@@ -1285,7 +1285,7 @@
 		 */
 		int hard_sector = sector_size;
 		sector_t sz = (sdkp->capacity/2) * (hard_sector/256);
-		request_queue_t *queue = sdp->request_queue;
+		struct request_queue *queue = sdp->request_queue;
 		sector_t mb = sz;
 
 		blk_queue_hardsect_size(queue, hard_sector);