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/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index 4d8798b..859f870 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -674,10 +674,10 @@
 		}
 		bytes_done += bvec->bv_len;
 	}
-	bio_endio(bio, bytes_done, 0);
+	bio_endio(bio, 0);
 	return 0;
 fail:
-	bio_io_error(bio, bio->bi_size);
+	bio_io_error(bio);
 	return 0;
 }