patch 9.0.0556: leaking memory with nested functions

Problem:    Leaking memory with nested functions.
Solution:   Free saved pointer.
diff --git a/src/version.c b/src/version.c
index 617b76c..8df30bd 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    556,
+/**/
     555,
 /**/
     554,