[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/block/ub.c b/drivers/block/ub.c
index 8b13d7d..c57dd2b 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -503,7 +503,7 @@
 {
 	struct list_head *p;
 	struct ub_lun *lun;
-	request_queue_t *q;
+	struct request_queue *q;
 
 	while (!list_empty(&sc->luns)) {
 		p = sc->luns.next;
@@ -619,7 +619,7 @@
  * The request function is our main entry point
  */
 
-static void ub_request_fn(request_queue_t *q)
+static void ub_request_fn(struct request_queue *q)
 {
 	struct ub_lun *lun = q->queuedata;
 	struct request *rq;
@@ -2273,7 +2273,7 @@
 static int ub_probe_lun(struct ub_dev *sc, int lnum)
 {
 	struct ub_lun *lun;
-	request_queue_t *q;
+	struct request_queue *q;
 	struct gendisk *disk;
 	int rc;