patch 8.2.4333: cstack not always passed to where it is needed

Problem:    cstack not always passed to where it is needed.
Solution:   Pass ctack through functions.
diff --git a/src/vim9expr.c b/src/vim9expr.c
index b44f928..1e53478 100644
--- a/src/vim9expr.c
+++ b/src/vim9expr.c
@@ -256,7 +256,7 @@
     if (!SCRIPT_ID_VALID(current_sctx.sc_sid))
 	return FAIL;
     si = SCRIPT_ITEM(current_sctx.sc_sid);
-    idx = get_script_item_idx(current_sctx.sc_sid, name, 0, cctx);
+    idx = get_script_item_idx(current_sctx.sc_sid, name, 0, cctx, NULL);
     if (idx >= 0)
     {
 	svar_T		*sv = ((svar_T *)si->sn_var_vals.ga_data) + idx;
@@ -316,7 +316,7 @@
 	else
 	{
 	    idx = find_exported(import->imp_sid, exp_name, &ufunc, &type,
-								   cctx, TRUE);
+							    cctx, NULL, TRUE);
 	}
 	*p = cc;
 	*end = p;