Fix a leak of the device context. r=bruce.

git-svn-id: svn://10.0.0.236/trunk@63366 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/layout/base/src/nsFrameImageLoader.cpp

@@ -155,6 +155,8 @@ nsFrameImageLoader::Init(nsIPresContext* aPresContext,
     aPresContext->GetTwipsToPixels(&t2p);
     aPresContext->GetDeviceContext(&theDC);
     theDC->GetCanonicalPixelScale(devScale);
+    NS_RELEASE(theDC);
+    
     desiredWidth = NSToCoordRound((mDesiredSize.width * t2p)/devScale);
     desiredHeight = NSToCoordRound((mDesiredSize.height * t2p)/devScale);
   }