Improve error handling in graphics memory init

src/xenia/gpu/vulkan/vulkan_shared_memory.cc

@@ -44,7 +44,9 @@ VulkanSharedMemory::VulkanSharedMemory(
 VulkanSharedMemory::~VulkanSharedMemory() { Shutdown(true); }
 
 bool VulkanSharedMemory::Initialize() {
-  InitializeCommon();
+  if (!InitializeCommon()) {
+    return false;
+  }
 
   const ui::vulkan::VulkanDevice* const vulkan_device =
       command_processor_.GetVulkanDevice();