[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/sr.c b/drivers/scsi/sr.c
index e7b6a7f..902eb11 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -624,7 +624,7 @@
 	unsigned char *buffer;
 	int the_result, retries = 3;
 	int sector_size;
-	request_queue_t *queue;
+	struct request_queue *queue;
 
 	buffer = kmalloc(512, GFP_KERNEL | GFP_DMA);
 	if (!buffer)