patch 8.2.2505: Vim9: crash after defining function with invalid return type

Problem:    Vim9: crash after defining function with invalid return type.
Solution:   Clear function growarrays.  Fix memory leak.
diff --git a/src/userfunc.c b/src/userfunc.c
index c9b15fd..3e17621 100644
--- a/src/userfunc.c
+++ b/src/userfunc.c
@@ -3955,8 +3955,15 @@
 erret:
     ga_clear_strings(&newargs);
     ga_clear_strings(&default_args);
+    if (fp != NULL)
+    {
+	ga_init(&fp->uf_args);
+	ga_init(&fp->uf_def_args);
+    }
 errret_2:
     ga_clear_strings(&newlines);
+    if (fp != NULL)
+	VIM_CLEAR(fp->uf_arg_types);
 ret_free:
     ga_clear_strings(&argtypes);
     vim_free(skip_until);