message: Make sure to grab a new command buffer each iteration in GetBufferData
diff: @@ -1290,6 +1290,8 @@ void VulkanDebugManager::GetBufferData(ResourceId buff, uint64_t offset, uint64_
  {
  VkDeviceSize chunkSize = RDCMIN(sizeRemaining, STAGE_BUFFER_BYTE_SIZE);
  + cmd = m_pDriver->GetNextCmd();
  +
  vkr = vt->BeginCommandBuffer(Unwrap(cmd), &beginInfo);
  RDCASSERTEQUAL(vkr, VK_SUCCESS);
  