account for delayed jobs when reaping threads

reap_threads does not account for jobs that have been delayed
(e.g. via startdelay) which may lead to all threads being
terminated.  The following job file demonstrates the problem:

	[job1]
	filename=job1file
	size=16k
	startdelay=1

Signed-off-by: Aaron Carroll <aaronc@gelato.unsw.edu.au>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fio.c b/fio.c
index 355d873..6e25c5f 100644
--- a/fio.c
+++ b/fio.c
@@ -1024,7 +1024,11 @@
 		else
 			realthreads++;
 
-		if (!td->pid || td->runstate == TD_REAPED)
+		if (!td->pid) {
+			pending++;
+			continue;
+		}
+		if (td->runstate == TD_REAPED)
 			continue;
 		if (td->o.use_thread) {
 			if (td->runstate == TD_EXITED) {