[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/ide/ide-disk.c b/drivers/ide/ide-disk.c
index b1304a7..5ce4216 100644
--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -679,7 +679,7 @@
 };
 #endif	/* CONFIG_IDE_PROC_FS */
 
-static void idedisk_prepare_flush(request_queue_t *q, struct request *rq)
+static void idedisk_prepare_flush(struct request_queue *q, struct request *rq)
 {
 	ide_drive_t *drive = q->queuedata;
 
@@ -697,7 +697,7 @@
 	rq->buffer = rq->cmd;
 }
 
-static int idedisk_issue_flush(request_queue_t *q, struct gendisk *disk,
+static int idedisk_issue_flush(struct request_queue *q, struct gendisk *disk,
 			       sector_t *error_sector)
 {
 	ide_drive_t *drive = q->queuedata;