new smatch

@@ -102,18 +102,22 @@
 static void match_param_err_or_null(const char *fn, struct expression *call_expr,
                         struct expression *assign_expr, void *_param)
 {
         int param = PTR_INT(_param);
         struct expression *arg;
-        struct range_list *rl;
+        struct range_list *pre, *rl;
         struct smatch_state *pre_state;
         struct smatch_state *end_state;
 
         arg = get_argument_from_call_expr(call_expr->args, param);
         pre_state = get_state_expr(SMATCH_EXTRA, arg);
+        if (pre_state)
+                pre = estate_rl(pre_state);
+        else
+                pre = alloc_whole_rl(&ptr_ctype);
         call_results_to_rl(call_expr, &ptr_ctype, "0,(-4095)-(-1)", &rl);
-        rl = rl_intersection(estate_rl(pre_state), rl);
+        rl = rl_intersection(pre, rl);
         rl = cast_rl(get_type(arg), rl);
         end_state = alloc_estate_rl(rl);
         set_extra_expr_nomod(arg, end_state);
 }