Tests: Fix t_unopt_combo_waive with -Oi

test_regress/t/t_unopt_combo.vlt

@@ -1,3 +1,3 @@
 `verilator_config
 
-lint_off -rule UNOPTFLAT -file "*t_unopt_combo.v" -match "Signal unoptimizable: Feedback to clock or circular logic: 't.c'"
+lint_off -rule UNOPTFLAT -file "*t_unopt_combo.v" -match "Signal unoptimizable: Feedback to clock or circular logic: *"

test_regress/t/t_unopt_combo_waive.pl

@@ -14,7 +14,7 @@ top_filename("t/t_unopt_combo.v");
 
 compile(
     v_flags2 => ['+define+ATTRIBUTES', "t/t_unopt_combo.vlt"],
-    expect_filename => $Self->{golden_filename},  # Expect no output, as we waived
+    # Passes, as we waived
     );
 
 ok(1);