Fixup wrong enum used for __check_min_rate()

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
diff --git a/fio.c b/fio.c
index 76c6ebd..34956e9 100644
--- a/fio.c
+++ b/fio.c
@@ -180,7 +180,7 @@
  * Check if we are above the minimum rate given.
  */
 static int __check_min_rate(struct thread_data *td, struct timeval *now,
-			    enum td_ddir ddir)
+			    enum fio_ddir ddir)
 {
 	unsigned long long bytes = 0;
 	unsigned long iops = 0;