patch 8.2.3340: accessing uninitialized pointer

Problem:    Accessing uninitialized pointer.
Solution:   Set pointer to NULL.
diff --git a/src/version.c b/src/version.c
index 4c1be4e..87c315a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3340,
+/**/
     3339,
 /**/
     3338,