patch 8.2.2537: Vim9: crash when map() fails

Problem:    Vim9: crash when map() fails.
Solution:   Clear typval before using it. (closes #7884)
diff --git a/src/version.c b/src/version.c
index 3f5ae9d..8d29d52 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2537,
+/**/
     2536,
 /**/
     2535,