Don't inherit new_group for sub-jobs

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/init.c b/init.c
index c1f774d..5d35a63 100644
--- a/init.c
+++ b/init.c
@@ -481,6 +481,7 @@
 
 		td_new->o.numjobs = 1;
 		td_new->o.stonewall = 0;
+		td_new->o.new_group = 0;
 
 		if (file_alloced) {
 			td_new->o.filename = NULL;