Bug 1208927 - Initialize queryD3DKMTStatistics so that it can't be accessed uninitialized; r=jrmuizel

gfx/thebes/gfxWindowsPlatform.cpp

@@ -194,7 +194,7 @@ public:
         IDXGIAdapter *DXGIAdapter;
 
         HMODULE gdi32Handle;
-        PFND3DKMTQS queryD3DKMTStatistics;
+        PFND3DKMTQS queryD3DKMTStatistics = nullptr;
 
         // GPU memory reporting is not available before Windows 7
         if (!IsWin7OrLater())