Drop 'size' argument from bio_endio and bi_end_io

As bi_end_io is only called once when the reqeust is complete,
the 'size' argument is now redundant.  Remove it.

Now there is no need for bio_endio to subtract the size completed
from bi_size.  So don't do that either.

While we are at it, change bi_end_io to return void.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/drivers/md/linear.c b/drivers/md/linear.c
index 17f795c..5501487 100644
--- a/drivers/md/linear.c
+++ b/drivers/md/linear.c
@@ -338,7 +338,7 @@
 	sector_t block;
 
 	if (unlikely(bio_barrier(bio))) {
-		bio_endio(bio, bio->bi_size, -EOPNOTSUPP);
+		bio_endio(bio, -EOPNOTSUPP);
 		return 0;
 	}
 
@@ -358,7 +358,7 @@
 			bdevname(tmp_dev->rdev->bdev, b),
 			(unsigned long long)tmp_dev->size,
 		        (unsigned long long)tmp_dev->offset);
-		bio_io_error(bio, bio->bi_size);
+		bio_io_error(bio);
 		return 0;
 	}
 	if (unlikely(bio->bi_sector + (bio->bi_size >> 9) >