[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/cdrom/viocd.c b/drivers/cdrom/viocd.c
index 44cd7b2..e51550d 100644
--- a/drivers/cdrom/viocd.c
+++ b/drivers/cdrom/viocd.c
@@ -398,7 +398,7 @@
 
 static int rwreq;
 
-static void do_viocd_request(request_queue_t *q)
+static void do_viocd_request(struct request_queue *q)
 {
 	struct request *req;