patch 8.1.0843: memory leak when running "make test_cd"

Problem:    Memory leak when running "make test_cd".
Solution:   Free the stack element when failing. (Dominique Pelle,
            closes #3877)
diff --git a/src/version.c b/src/version.c
index c8bb2f7..e78fde7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -784,6 +784,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    843,
+/**/
     842,
 /**/
     841,