[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/dm-table.c b/drivers/md/dm-table.c
index 2fc199b..2bcde57 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -526,7 +526,7 @@
 
 void dm_set_device_limits(struct dm_target *ti, struct block_device *bdev)
 {
-	request_queue_t *q = bdev_get_queue(bdev);
+	struct request_queue *q = bdev_get_queue(bdev);
 	struct io_restrictions *rs = &ti->limits;
 
 	/*
@@ -979,7 +979,7 @@
 	devices = dm_table_get_devices(t);
 	for (d = devices->next; d != devices; d = d->next) {
 		struct dm_dev *dd = list_entry(d, struct dm_dev, list);
-		request_queue_t *q = bdev_get_queue(dd->bdev);
+		struct request_queue *q = bdev_get_queue(dd->bdev);
 		r |= bdi_congested(&q->backing_dev_info, bdi_bits);
 	}
 
@@ -992,7 +992,7 @@
 
 	for (d = devices->next; d != devices; d = d->next) {
 		struct dm_dev *dd = list_entry(d, struct dm_dev, list);
-		request_queue_t *q = bdev_get_queue(dd->bdev);
+		struct request_queue *q = bdev_get_queue(dd->bdev);
 
 		if (q->unplug_fn)
 			q->unplug_fn(q);
@@ -1011,7 +1011,7 @@
 
 	for (d = devices->next; d != devices; d = d->next) {
 		struct dm_dev *dd = list_entry(d, struct dm_dev, list);
-		request_queue_t *q = bdev_get_queue(dd->bdev);
+		struct request_queue *q = bdev_get_queue(dd->bdev);
 		int err;
 
 		if (!q->issue_flush_fn)