Fix inverted logic in gtod_reduce()

Fixes a bug in the previous commit, where someone wasn't
thinking straight...

Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/io_u.c b/io_u.c
index 5f39987..61038a4 100644
--- a/io_u.c
+++ b/io_u.c
@@ -1523,8 +1523,8 @@
 
 static inline int gtod_reduce(struct thread_data *td)
 {
-	return !td->o.disable_clat || !td->o.disable_lat ||
-		!td->o.disable_slat || !td->o.disable_bw;
+	return td->o.disable_clat && td->o.disable_lat && !td->o.disable_slat
+		&& td->o.disable_bw;
 }
 
 static void account_io_completion(struct thread_data *td, struct io_u *io_u,