Mark "read_iolog" as a parent for "replay_no_stall"

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/options.c b/options.c
index 82a7289..9718dc5 100644
--- a/options.c
+++ b/options.c
@@ -1486,6 +1486,7 @@
 		.type	= FIO_OPT_INT,
 		.off1	= td_var_offset(no_stall),
 		.def	= "0",
+		.parent	= "read_iolog",
 		.help	= "Playback IO pattern file as fast as possible without stalls",
 	},
 	{