patch 9.0.0450: return value of argument check functions is inconsistent

Problem:    Return value of argument check functions is inconsistent.
Solution:   Return OK/FAIL instead of TRUE/FALSE. (closes #11112)
diff --git a/src/version.c b/src/version.c
index 3633b19..f733398 100644
--- a/src/version.c
+++ b/src/version.c
@@ -704,6 +704,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    450,
+/**/
     449,
 /**/
     448,