Move getrusage() out of thread_stat

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/fio.c b/fio.c
index baa17cf..765c517 100644
--- a/fio.c
+++ b/fio.c
@@ -1169,7 +1169,7 @@
 	}
 
 	fio_gettime(&td->epoch, NULL);
-	getrusage(RUSAGE_SELF, &td->ts.ru_start);
+	getrusage(RUSAGE_SELF, &td->ru_start);
 
 	clear_state = 0;
 	while (keep_running(td)) {