iolog: remember to add bytes to total IO size

This fixes an issue with replay of iologs.

Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/iolog.c b/iolog.c
index cac1aba..fd1e9e4 100644
--- a/iolog.c
+++ b/iolog.c
@@ -410,6 +410,7 @@
 				td->o.max_bs[rw] = bytes;
 			ipo->fileno = fileno;
 			ipo->file_action = file_action;
+			td->o.size += bytes;
 		}
 
 		queue_io_piece(td, ipo);