Update 30_multisampling.cpp

Author: lmichaudel

attachments/30_multisampling.cpp

@@ -219,7 +219,8 @@ class HelloTriangleApplication {
 
     void cleanupSwapChain() {
         swapChainImageViews.clear();
-        }
+        swapChain = nullptr;
+    }
 
     void cleanup() const {
         glfwDestroyWindow(window);