[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/md/md.c b/drivers/md/md.c
index 65ddc88..f883b7e 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -211,7 +211,7 @@
 		)
 
 
-static int md_fail_request (request_queue_t *q, struct bio *bio)
+static int md_fail_request (struct request_queue *q, struct bio *bio)
 {
 	bio_io_error(bio, bio->bi_size);
 	return 0;