block: rename __make_request() to blk_queue_bio()

Now that it's exported, lets put it in a more sane namespace.

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index e9c3d9b..085f954 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -675,7 +675,7 @@
 extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
 			 struct scsi_ioctl_command __user *);
 
-extern int __make_request(struct request_queue *q, struct bio *bio);
+extern int blk_queue_bio(struct request_queue *q, struct bio *bio);
 
 /*
  * A queue has just exitted congestion.  Note this in the global counter of