Fix broken completion latency numbers

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/io_u.c b/io_u.c
index 6549804..9668395 100644
--- a/io_u.c
+++ b/io_u.c
@@ -999,7 +999,7 @@
 							&icd->time);
 
 			if (!td->o.disable_clat) {
-				add_clat_sample(td, idx, usec, bytes);
+				add_clat_sample(td, idx, lusec, bytes);
 				io_u_mark_latency(td, lusec);
 			}
 			if (!td->o.disable_bw)