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/include/linux/swap.h b/include/linux/swap.h
index 665f85f..edf681a 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -221,7 +221,7 @@
 /* linux/mm/page_io.c */
 extern int swap_readpage(struct file *, struct page *);
 extern int swap_writepage(struct page *page, struct writeback_control *wbc);
-extern int end_swap_bio_read(struct bio *bio, unsigned int bytes_done, int err);
+extern void end_swap_bio_read(struct bio *bio, int err);
 
 /* linux/mm/swap_state.c */
 extern struct address_space swapper_space;