Vulkan: Fix waiting on non-existant fence when reading back

Source/Core/VideoBackends/Vulkan/CommandBufferManager.cpp

@@ -377,9 +377,6 @@ void CommandBufferManager::OnCommandBufferExecuted(size_t index)
     backup_iter->second.second(resources.fence);
   }
 
-  for (const auto& iter : m_fence_point_callbacks)
-    iter.second.second(resources.fence);
-
   // Clean up all objects pending destruction on this command buffer
   for (auto& it : resources.cleanup_resources)
     it();

Source/Core/VideoBackends/Vulkan/VKTexture.cpp

@@ -497,6 +497,7 @@ void VKStagingTexture::Flush()
   {
     // WaitForFence should fire the callback.
     g_command_buffer_mgr->WaitForFence(m_flush_fence);
+    m_flush_fence = VK_NULL_HANDLE;
   }
   else
   {