[PATCH] Thread option didn't work

We stored to the wrong location, woops.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/init.c b/init.c
index 79b6e5c..559ebc1 100644
--- a/init.c
+++ b/init.c
@@ -413,7 +413,7 @@
 	{
 		.name	= "thread",
 		.type	= FIO_OPT_STR_SET,
-		.off1	= td_var_offset(thread),
+		.off1	= td_var_offset(use_thread),
 		.help	= "Use threads instead of forks",
 	},
 	{