patch 8.2.2412: not all fields in "cstack" are initialized

Problem:    Not all fields in "cstack" are initialized which might cause a
            crash.
Solution:   Use CLEAR_FIELD().
diff --git a/src/version.c b/src/version.c
index 086d79f..9a67633 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2412,
+/**/
     2411,
 /**/
     2410,