c++/reflection: amend comment

Clarify that the current code seems fine.

gcc/cp/ChangeLog:

	* reflect.cc (eval_variable_of): Update comment.
diff --git a/gcc/cp/reflect.cc b/gcc/cp/reflect.cc
index 237f630..8f85a6b 100644
--- a/gcc/cp/reflect.cc
+++ b/gcc/cp/reflect.cc
@@ -3036,7 +3036,7 @@
 {
   if (eval_is_function_parameter (r, kind) == boolean_false_node
       /* This doesn't consider the points corresponding to injected
-	 declarations.  */
+	 declarations, but that doesn't seem needed.  */
       || DECL_CONTEXT (r) != current_function_decl)
     return throw_exception (loc, ctx, "reflection does not represent "
 				      "parameter of current function",