patch 8.0.1492: memory leak in balloon_split()

Problem:    Memory leak in balloon_split().
Solution:   Free the balloon lines. Free the balloon when exiting.
diff --git a/src/version.c b/src/version.c
index 1bd0295..be5f864 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1492,
+/**/
     1491,
 /**/
     1490,