patch 9.0.0617: calling function for reduce() has too much overhead

Problem:    Calling function for reduce() has too much overhead.
Solution:   Only call clear_tv() when needed.
diff --git a/src/version.c b/src/version.c
index 815f27b..43569d0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    617,
+/**/
     616,
 /**/
     615,