patch 8.2.1749: Vim9: crash when closure fails in nested function

Problem:    Vim9: crash when closure fails in nested function.
Solution:   Handle function returns before dereferencing remaining closures.
            (closes #7008)

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1749,
 /**/
     1748,
 /**/