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/raid0.c b/drivers/md/raid0.c
index b8216bc..ef0da2d 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -420,7 +420,7 @@
 	const int rw = bio_data_dir(bio);
 
 	if (unlikely(bio_barrier(bio))) {
-		bio_endio(bio, bio->bi_size, -EOPNOTSUPP);
+		bio_endio(bio, -EOPNOTSUPP);
 		return 0;
 	}
 
@@ -490,7 +490,7 @@
 		" or bigger than %dk %llu %d\n", chunk_size, 
 		(unsigned long long)bio->bi_sector, bio->bi_size >> 10);
 
-	bio_io_error(bio, bio->bi_size);
+	bio_io_error(bio);
 	return 0;
 }