[Vulkan] Enforce semicolons on VK_SAFE_DESTROY

src/xenia/ui/vulkan/vulkan_util.h

@@ -26,10 +26,15 @@ namespace ui {
 namespace vulkan {
 
 #define VK_SAFE_DESTROY(fn, dev, obj, alloc) \
+  \
+do {                                         \
     if (obj) {                               \
       fn(dev, obj, alloc);                   \
       obj = nullptr;                         \
-  }
+    }                                        \
+  \
+}                                         \
+  while (0)
 
 class Fence {
  public: