Fix bad min rate check

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fio.c b/fio.c
index 6464b6d..61aabb3 100644
--- a/fio.c
+++ b/fio.c
@@ -186,6 +186,9 @@
 	unsigned int rate_iops = 0;
 	unsigned int rate_iops_min = 0;
 
+	if (!td->o.ratemin[ddir] && !td->o.rate_iops_min[ddir])
+		return 0;
+
 	/*
 	 * allow a 2 second settle period in the beginning
 	 */