Bug 1101650 - Fix mClearOnBind logic. r=jmuizel

gfx/layers/d3d11/TextureD3D11.cpp

@@ -658,7 +658,7 @@ CompositingRenderTargetD3D11::CompositingRenderTargetD3D11(ID3D11Texture2D* aTex
 void
 CompositingRenderTargetD3D11::BindRenderTarget(ID3D11DeviceContext* aContext)
 {
-  if (!mClearOnBind) {
+  if (mClearOnBind) {
     FLOAT clear[] = { 0, 0, 0, 0 };
     aContext->ClearRenderTargetView(mRTView, clear);
     mClearOnBind = false;