Bug putting 0s in the log everywhere

src/backend/core/mmio/PI.cpp

@@ -319,7 +319,7 @@ void PI::BusWrite<u32, false>(u32 addr, u32 val) {
     case CART_ISVIEWER_FLUSH:
       {
         if (val < CART_ISVIEWER_SIZE) {
-          std::string message(val + 1, 0);
+          std::string message(val, 0);
           std::copy_n(mem.isviewer.begin(), val, message.begin());
           mem.isviewer_sink << message;
           mem.isviewer_sink.flush();