patch 8.2.3902: Vim9: double free with nested :def function

Problem:    Vim9: double free with nested :def function.
Solution:   Pass "line_to_free" from compile_def_function() and make sure
            cmdlinep is valid.
diff --git a/src/version.c b/src/version.c
index 9a5ef2c..55ddb06 100644
--- a/src/version.c
+++ b/src/version.c
@@ -750,6 +750,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3902,
+/**/
     3901,
 /**/
     3900,